9b1ab9f0ec
'progend' is short for 'program backend'. The progend is intended to operate on combined state from a fragment backend and a vertex backend. The progend has an 'end' function which is run whenever the pipeline is flushed and the two pipeline change notification functions. All of the progends are run whenever the pipeline is flushed instead of selecting a single one because it is possible that multiple progends may be in use for example if the vertends and fragends are different. The GLSL progend will take the shaders generated by the fragend and vertend and link them into a single program. The fragend code has been changed to only generate the shader and not the program. The idea is that pipelines can share fragment shader objects even if their vertex state is different. The authority for the progend needs to be the combined authority on the vertend and fragend state.
905 lines
28 KiB
C
905 lines
28 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2008,2009,2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*
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*
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* Authors:
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* Robert Bragg <robert@linux.intel.com>
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* Neil Roberts <neil@linux.intel.com>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include "cogl-pipeline-private.h"
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#include "cogl-shader-private.h"
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#include "cogl-blend-string.h"
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#ifdef COGL_PIPELINE_FRAGEND_GLSL
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#include "cogl.h"
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#include "cogl-internal.h"
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#include "cogl-context.h"
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#include "cogl-handle.h"
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#include "cogl-shader-private.h"
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#include "cogl-program-private.h"
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#ifndef HAVE_COGL_GLES2
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#define glCreateShader ctx->drv.pf_glCreateShader
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#define glGetShaderiv ctx->drv.pf_glGetShaderiv
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#define glGetShaderInfoLog ctx->drv.pf_glGetShaderInfoLog
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#define glCompileShader ctx->drv.pf_glCompileShader
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#define glShaderSource ctx->drv.pf_glShaderSource
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#define glDeleteShader ctx->drv.pf_glDeleteShader
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#endif /* HAVE_COGL_GLES2 */
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#include <glib.h>
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/*
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* GL/GLES compatability defines for pipeline thingies:
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*/
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#ifdef HAVE_COGL_GLES2
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#include "../gles/cogl-gles2-wrapper.h"
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#endif
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/* This might not be defined on GLES */
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#ifndef GL_TEXTURE_3D
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#define GL_TEXTURE_3D 0x806F
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#endif
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typedef struct _UnitState
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{
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unsigned int sampled:1;
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unsigned int combine_constant_used:1;
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} UnitState;
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typedef struct _GlslShaderState
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{
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int ref_count;
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GLuint gl_shader;
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GString *header, *source;
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UnitState *unit_state;
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/* Age of the user program that was current when the shader was
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generated. We need to keep track of this because if the user
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program changes then we may need to redecide whether to generate
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a shader at all */
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unsigned int user_program_age;
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} GlslShaderState;
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typedef struct _CoglPipelineFragendGlslPrivate
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{
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GlslShaderState *glsl_shader_state;
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} CoglPipelineFragendGlslPrivate;
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const CoglPipelineFragend _cogl_pipeline_glsl_backend;
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static GlslShaderState *
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glsl_shader_state_new (int n_layers)
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{
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GlslShaderState *state = g_slice_new0 (GlslShaderState);
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state->ref_count = 1;
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state->unit_state = g_new0 (UnitState, n_layers);
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return state;
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}
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static GlslShaderState *
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glsl_shader_state_ref (GlslShaderState *state)
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{
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state->ref_count++;
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return state;
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}
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void
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glsl_shader_state_unref (GlslShaderState *state)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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g_return_if_fail (state->ref_count > 0);
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state->ref_count--;
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if (state->ref_count == 0)
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{
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if (state->gl_shader)
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GE( glDeleteShader (state->gl_shader) );
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g_free (state->unit_state);
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g_slice_free (GlslShaderState, state);
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}
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}
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static CoglPipelineFragendGlslPrivate *
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get_glsl_priv (CoglPipeline *pipeline)
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{
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if (!(pipeline->fragend_priv_set_mask & COGL_PIPELINE_FRAGEND_GLSL_MASK))
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return NULL;
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return pipeline->fragend_privs[COGL_PIPELINE_FRAGEND_GLSL];
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}
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static void
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set_glsl_priv (CoglPipeline *pipeline, CoglPipelineFragendGlslPrivate *priv)
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{
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if (priv)
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{
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pipeline->fragend_privs[COGL_PIPELINE_FRAGEND_GLSL] = priv;
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pipeline->fragend_priv_set_mask |= COGL_PIPELINE_FRAGEND_GLSL_MASK;
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}
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else
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pipeline->fragend_priv_set_mask &= ~COGL_PIPELINE_FRAGEND_GLSL_MASK;
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}
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static GlslShaderState *
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get_glsl_shader_state (CoglPipeline *pipeline)
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{
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CoglPipelineFragendGlslPrivate *priv = get_glsl_priv (pipeline);
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if (!priv)
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return NULL;
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return priv->glsl_shader_state;
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}
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GLuint
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_cogl_pipeline_fragend_glsl_get_shader (CoglPipeline *pipeline)
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{
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GlslShaderState *glsl_shader_state = get_glsl_shader_state (pipeline);
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if (glsl_shader_state)
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return glsl_shader_state->gl_shader;
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else
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return 0;
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}
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static void
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dirty_glsl_shader_state (CoglPipeline *pipeline)
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{
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CoglPipelineFragendGlslPrivate *priv;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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priv = get_glsl_priv (pipeline);
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if (!priv)
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return;
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if (priv->glsl_shader_state)
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{
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glsl_shader_state_unref (priv->glsl_shader_state);
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priv->glsl_shader_state = NULL;
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}
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}
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static gboolean
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_cogl_pipeline_fragend_glsl_start (CoglPipeline *pipeline,
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int n_layers,
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unsigned long pipelines_difference,
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int n_tex_coord_attribs)
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{
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CoglPipelineFragendGlslPrivate *priv;
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CoglPipeline *authority;
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CoglPipelineFragendGlslPrivate *authority_priv;
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CoglProgram *user_program;
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int i;
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_COGL_GET_CONTEXT (ctx, FALSE);
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if (!cogl_features_available (COGL_FEATURE_SHADERS_GLSL))
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return FALSE;
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user_program = cogl_pipeline_get_user_program (pipeline);
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/* If the program isn't GLSL then we should let another backend
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handle it */
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if (user_program &&
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_cogl_program_get_language (user_program) != COGL_SHADER_LANGUAGE_GLSL)
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return FALSE;
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/* Now lookup our glsl backend private state (allocating if
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* necessary) */
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priv = get_glsl_priv (pipeline);
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if (!priv)
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{
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priv = g_slice_new0 (CoglPipelineFragendGlslPrivate);
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set_glsl_priv (pipeline, priv);
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}
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if (!priv->glsl_shader_state)
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{
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/* If we don't have an associated glsl shader yet then find the
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* glsl-authority (the oldest ancestor whose state will result in
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* the same shader being generated as for this pipeline).
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*
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* We always make sure to associate new shader with the
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* glsl-authority to maximize the chance that other pipelines can
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* share it.
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*/
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authority = _cogl_pipeline_find_equivalent_parent
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(pipeline,
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COGL_PIPELINE_STATE_AFFECTS_FRAGMENT_CODEGEN &
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~COGL_PIPELINE_STATE_LAYERS,
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COGL_PIPELINE_LAYER_STATE_AFFECTS_FRAGMENT_CODEGEN,
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COGL_PIPELINE_FIND_EQUIVALENT_COMPARE_TEXTURE_TARGET);
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authority_priv = get_glsl_priv (authority);
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if (!authority_priv)
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{
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authority_priv = g_slice_new0 (CoglPipelineFragendGlslPrivate);
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set_glsl_priv (authority, authority_priv);
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}
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/* If we don't have an existing program associated with the
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* glsl-authority then start generating code for a new shader...
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*/
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if (!authority_priv->glsl_shader_state)
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{
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GlslShaderState *glsl_shader_state =
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glsl_shader_state_new (n_layers);
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authority_priv->glsl_shader_state = glsl_shader_state;
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}
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/* If the pipeline isn't actually its own glsl-authority
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* then take a reference to the program state associated
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* with the glsl-authority... */
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if (authority != pipeline)
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priv->glsl_shader_state =
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glsl_shader_state_ref (authority_priv->glsl_shader_state);
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}
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if (priv->glsl_shader_state->gl_shader)
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{
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/* If we already have a valid GLSL shader then we don't need to
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generate a new one. However if there's a user program and it
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has changed since the last link then we do need a new shader */
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if (user_program == NULL ||
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(priv->glsl_shader_state->user_program_age == user_program->age))
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return TRUE;
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/* We need to recreate the shader so destroy the existing one */
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GE( glDeleteShader (priv->glsl_shader_state->gl_shader) );
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priv->glsl_shader_state->gl_shader = 0;
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}
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/* If we make it here then we have a glsl_shader_state struct
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without a gl_shader either because this is the first time we've
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encountered it or because the user program has changed */
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if (user_program)
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priv->glsl_shader_state->user_program_age = user_program->age;
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/* If the user program contains a fragment shader then we don't need
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to generate one */
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if (user_program &&
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_cogl_program_has_fragment_shader (user_program))
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return TRUE;
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/* We reuse two grow-only GStrings for code-gen. One string
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contains the uniform and attribute declarations while the
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other contains the main function. We need two strings
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because we need to dynamically declare attributes as the
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add_layer callback is invoked */
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g_string_set_size (ctx->fragment_header_buffer, 0);
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g_string_set_size (ctx->fragment_source_buffer, 0);
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priv->glsl_shader_state->header = ctx->fragment_header_buffer;
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priv->glsl_shader_state->source = ctx->fragment_source_buffer;
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g_string_append (priv->glsl_shader_state->source,
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"void\n"
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"main ()\n"
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"{\n");
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for (i = 0; i < n_layers; i++)
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{
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priv->glsl_shader_state->unit_state[i].sampled = FALSE;
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priv->glsl_shader_state->unit_state[i].combine_constant_used = FALSE;
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}
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return TRUE;
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}
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static void
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add_constant_lookup (GlslShaderState *glsl_shader_state,
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CoglPipeline *pipeline,
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CoglPipelineLayer *layer,
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const char *swizzle)
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{
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int unit_index = _cogl_pipeline_layer_get_unit_index (layer);
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/* Create a sampler uniform for this layer if we haven't already */
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if (!glsl_shader_state->unit_state[unit_index].combine_constant_used)
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{
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g_string_append_printf (glsl_shader_state->header,
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"uniform vec4 _cogl_layer_constant_%i;\n",
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unit_index);
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glsl_shader_state->unit_state[unit_index].combine_constant_used = TRUE;
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}
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g_string_append_printf (glsl_shader_state->source,
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"_cogl_layer_constant_%i.%s",
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unit_index, swizzle);
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}
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static void
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add_texture_lookup (GlslShaderState *glsl_shader_state,
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CoglPipeline *pipeline,
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CoglPipelineLayer *layer,
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const char *swizzle)
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{
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CoglHandle texture;
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int unit_index = _cogl_pipeline_layer_get_unit_index (layer);
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const char *target_string, *tex_coord_swizzle;
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texture = _cogl_pipeline_layer_get_texture (layer);
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if (texture == COGL_INVALID_HANDLE)
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{
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target_string = "2D";
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tex_coord_swizzle = "st";
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}
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else
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{
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GLenum gl_target;
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cogl_texture_get_gl_texture (texture, NULL, &gl_target);
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switch (gl_target)
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{
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#ifndef HAVE_COGL_GLES2
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case GL_TEXTURE_1D:
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target_string = "1D";
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tex_coord_swizzle = "s";
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break;
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#endif
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case GL_TEXTURE_2D:
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target_string = "2D";
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tex_coord_swizzle = "st";
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break;
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#ifdef GL_ARB_texture_rectangle
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case GL_TEXTURE_RECTANGLE_ARB:
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target_string = "2DRect";
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tex_coord_swizzle = "st";
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break;
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#endif
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case GL_TEXTURE_3D:
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target_string = "3D";
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tex_coord_swizzle = "stp";
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break;
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default:
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g_assert_not_reached ();
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}
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}
|
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|
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/* Create a sampler uniform for this layer if we haven't already */
|
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if (!glsl_shader_state->unit_state[unit_index].sampled)
|
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{
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g_string_append_printf (glsl_shader_state->header,
|
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"uniform sampler%s _cogl_sampler_%i;\n",
|
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target_string,
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unit_index);
|
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glsl_shader_state->unit_state[unit_index].sampled = TRUE;
|
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}
|
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g_string_append_printf (glsl_shader_state->source,
|
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"texture%s (_cogl_sampler_%i, ",
|
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target_string, unit_index);
|
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|
|
/* If point sprite coord generation is being used then divert to the
|
|
built-in varying var for that instead of the texture
|
|
coordinates. We don't want to do this under GL because in that
|
|
case we will instead use glTexEnv(GL_COORD_REPLACE) to replace
|
|
the texture coords with the point sprite coords. Although GL also
|
|
supports the gl_PointCoord variable, it requires GLSL 1.2 which
|
|
would mean we would have to declare the GLSL version and check
|
|
for it */
|
|
#ifdef HAVE_COGL_GLES2
|
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if (cogl_pipeline_get_layer_point_sprite_coords_enabled (pipeline,
|
|
layer->index))
|
|
g_string_append_printf (glsl_shader_state->source,
|
|
"gl_PointCoord.%s",
|
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tex_coord_swizzle);
|
|
else
|
|
#endif
|
|
g_string_append_printf (glsl_shader_state->source,
|
|
"cogl_tex_coord_in[%d].%s",
|
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unit_index, tex_coord_swizzle);
|
|
|
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g_string_append_printf (glsl_shader_state->source, ").%s", swizzle);
|
|
}
|
|
|
|
typedef struct
|
|
{
|
|
int unit_index;
|
|
CoglPipelineLayer *layer;
|
|
} FindPipelineLayerData;
|
|
|
|
static gboolean
|
|
find_pipeline_layer_cb (CoglPipelineLayer *layer,
|
|
void *user_data)
|
|
{
|
|
FindPipelineLayerData *data = user_data;
|
|
int unit_index;
|
|
|
|
unit_index = _cogl_pipeline_layer_get_unit_index (layer);
|
|
|
|
if (unit_index == data->unit_index)
|
|
{
|
|
data->layer = layer;
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
add_arg (GlslShaderState *glsl_shader_state,
|
|
CoglPipeline *pipeline,
|
|
CoglPipelineLayer *layer,
|
|
GLint src,
|
|
GLenum operand,
|
|
const char *swizzle)
|
|
{
|
|
GString *shader_source = glsl_shader_state->source;
|
|
char alpha_swizzle[5] = "aaaa";
|
|
|
|
g_string_append_c (shader_source, '(');
|
|
|
|
if (operand == GL_ONE_MINUS_SRC_COLOR || operand == GL_ONE_MINUS_SRC_ALPHA)
|
|
g_string_append_printf (shader_source,
|
|
"vec4(1.0, 1.0, 1.0, 1.0).%s - ",
|
|
swizzle);
|
|
|
|
/* If the operand is reading from the alpha then replace the swizzle
|
|
with the same number of copies of the alpha */
|
|
if (operand == GL_SRC_ALPHA || operand == GL_ONE_MINUS_SRC_ALPHA)
|
|
{
|
|
alpha_swizzle[strlen (swizzle)] = '\0';
|
|
swizzle = alpha_swizzle;
|
|
}
|
|
|
|
switch (src)
|
|
{
|
|
case GL_TEXTURE:
|
|
add_texture_lookup (glsl_shader_state,
|
|
pipeline,
|
|
layer,
|
|
swizzle);
|
|
break;
|
|
|
|
case GL_CONSTANT:
|
|
add_constant_lookup (glsl_shader_state,
|
|
pipeline,
|
|
layer,
|
|
swizzle);
|
|
break;
|
|
|
|
case GL_PREVIOUS:
|
|
if (_cogl_pipeline_layer_get_unit_index (layer) > 0)
|
|
{
|
|
g_string_append_printf (shader_source, "cogl_color_out.%s", swizzle);
|
|
break;
|
|
}
|
|
/* flow through */
|
|
case GL_PRIMARY_COLOR:
|
|
g_string_append_printf (shader_source, "cogl_color_in.%s", swizzle);
|
|
break;
|
|
|
|
default:
|
|
if (src >= GL_TEXTURE0 && src < GL_TEXTURE0 + 32)
|
|
{
|
|
FindPipelineLayerData data;
|
|
|
|
data.unit_index = src - GL_TEXTURE0;
|
|
data.layer = layer;
|
|
|
|
_cogl_pipeline_foreach_layer_internal (pipeline,
|
|
find_pipeline_layer_cb,
|
|
&data);
|
|
|
|
add_texture_lookup (glsl_shader_state,
|
|
pipeline,
|
|
data.layer,
|
|
swizzle);
|
|
}
|
|
break;
|
|
}
|
|
|
|
g_string_append_c (shader_source, ')');
|
|
}
|
|
|
|
static void
|
|
append_masked_combine (CoglPipeline *pipeline,
|
|
CoglPipelineLayer *layer,
|
|
const char *swizzle,
|
|
GLint function,
|
|
GLint *src,
|
|
GLint *op)
|
|
{
|
|
GlslShaderState *glsl_shader_state = get_glsl_shader_state (pipeline);
|
|
GString *shader_source = glsl_shader_state->source;
|
|
|
|
g_string_append_printf (glsl_shader_state->source,
|
|
" cogl_color_out.%s = ", swizzle);
|
|
|
|
switch (function)
|
|
{
|
|
case GL_REPLACE:
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[0], op[0], swizzle);
|
|
break;
|
|
|
|
case GL_MODULATE:
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[0], op[0], swizzle);
|
|
g_string_append (shader_source, " * ");
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[1], op[1], swizzle);
|
|
break;
|
|
|
|
case GL_ADD:
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[0], op[0], swizzle);
|
|
g_string_append (shader_source, " + ");
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[1], op[1], swizzle);
|
|
break;
|
|
|
|
case GL_ADD_SIGNED:
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[0], op[0], swizzle);
|
|
g_string_append (shader_source, " + ");
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[1], op[1], swizzle);
|
|
g_string_append_printf (shader_source,
|
|
" - vec4(0.5, 0.5, 0.5, 0.5).%s",
|
|
swizzle);
|
|
break;
|
|
|
|
case GL_SUBTRACT:
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[0], op[0], swizzle);
|
|
g_string_append (shader_source, " - ");
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[1], op[1], swizzle);
|
|
break;
|
|
|
|
case GL_INTERPOLATE:
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[0], op[0], swizzle);
|
|
g_string_append (shader_source, " * ");
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[2], op[2], swizzle);
|
|
g_string_append (shader_source, " + ");
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[1], op[1], swizzle);
|
|
g_string_append_printf (shader_source,
|
|
" * (vec4(1.0, 1.0, 1.0, 1.0).%s - ",
|
|
swizzle);
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[2], op[2], swizzle);
|
|
g_string_append_c (shader_source, ')');
|
|
break;
|
|
|
|
case GL_DOT3_RGB:
|
|
case GL_DOT3_RGBA:
|
|
g_string_append (shader_source, "vec4(4 * ((");
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[0], op[0], "r");
|
|
g_string_append (shader_source, " - 0.5) * (");
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[1], op[1], "r");
|
|
g_string_append (shader_source, " - 0.5) + (");
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[0], op[0], "g");
|
|
g_string_append (shader_source, " - 0.5) * (");
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[1], op[1], "g");
|
|
g_string_append (shader_source, " - 0.5) + (");
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[0], op[0], "b");
|
|
g_string_append (shader_source, " - 0.5) * (");
|
|
add_arg (glsl_shader_state, pipeline, layer,
|
|
src[1], op[1], "b");
|
|
g_string_append_printf (shader_source, " - 0.5))).%s", swizzle);
|
|
break;
|
|
}
|
|
|
|
g_string_append_printf (shader_source, ";\n");
|
|
}
|
|
|
|
static gboolean
|
|
_cogl_pipeline_fragend_glsl_add_layer (CoglPipeline *pipeline,
|
|
CoglPipelineLayer *layer,
|
|
unsigned long layers_difference)
|
|
{
|
|
GlslShaderState *glsl_shader_state = get_glsl_shader_state (pipeline);
|
|
CoglPipelineLayer *combine_authority =
|
|
_cogl_pipeline_layer_get_authority (layer,
|
|
COGL_PIPELINE_LAYER_STATE_COMBINE);
|
|
CoglPipelineLayerBigState *big_state = combine_authority->big_state;
|
|
|
|
if (!glsl_shader_state->source)
|
|
return TRUE;
|
|
|
|
if (!_cogl_pipeline_need_texture_combine_separate (combine_authority) ||
|
|
/* GL_DOT3_RGBA Is a bit weird as a GL_COMBINE_RGB function
|
|
* since if you use it, it overrides your ALPHA function...
|
|
*/
|
|
big_state->texture_combine_rgb_func == GL_DOT3_RGBA)
|
|
append_masked_combine (pipeline,
|
|
layer,
|
|
"rgba",
|
|
big_state->texture_combine_rgb_func,
|
|
big_state->texture_combine_rgb_src,
|
|
big_state->texture_combine_rgb_op);
|
|
else
|
|
{
|
|
append_masked_combine (pipeline,
|
|
layer,
|
|
"rgb",
|
|
big_state->texture_combine_rgb_func,
|
|
big_state->texture_combine_rgb_src,
|
|
big_state->texture_combine_rgb_op);
|
|
append_masked_combine (pipeline,
|
|
layer,
|
|
"a",
|
|
big_state->texture_combine_alpha_func,
|
|
big_state->texture_combine_alpha_src,
|
|
big_state->texture_combine_alpha_op);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
gboolean
|
|
_cogl_pipeline_fragend_glsl_passthrough (CoglPipeline *pipeline)
|
|
{
|
|
GlslShaderState *glsl_shader_state = get_glsl_shader_state (pipeline);
|
|
|
|
if (!glsl_shader_state->source)
|
|
return TRUE;
|
|
|
|
g_string_append (glsl_shader_state->source,
|
|
" cogl_color_out = cogl_color_in;\n");
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* GLES2 doesn't have alpha testing so we need to implement it in the
|
|
shader */
|
|
|
|
#ifdef HAVE_COGL_GLES2
|
|
|
|
static void
|
|
add_alpha_test_snippet (CoglPipeline *pipeline,
|
|
GlslShaderState *glsl_shader_state)
|
|
{
|
|
CoglPipelineAlphaFunc alpha_func;
|
|
|
|
alpha_func = cogl_pipeline_get_alpha_test_function (pipeline);
|
|
|
|
if (alpha_func == COGL_PIPELINE_ALPHA_FUNC_ALWAYS)
|
|
/* Do nothing */
|
|
return;
|
|
|
|
if (alpha_func == COGL_PIPELINE_ALPHA_FUNC_NEVER)
|
|
{
|
|
/* Always discard the fragment */
|
|
g_string_append (glsl_shader_state->source,
|
|
" discard;\n");
|
|
return;
|
|
}
|
|
|
|
/* For all of the other alpha functions we need a uniform for the
|
|
reference */
|
|
|
|
g_string_append (glsl_shader_state->header,
|
|
"uniform float _cogl_alpha_test_ref;\n");
|
|
|
|
g_string_append (glsl_shader_state->source,
|
|
" if (cogl_color_out.a ");
|
|
|
|
switch (alpha_func)
|
|
{
|
|
case COGL_PIPELINE_ALPHA_FUNC_LESS:
|
|
g_string_append (glsl_shader_state->source, ">=");
|
|
break;
|
|
case COGL_PIPELINE_ALPHA_FUNC_EQUAL:
|
|
g_string_append (glsl_shader_state->source, "!=");
|
|
break;
|
|
case COGL_PIPELINE_ALPHA_FUNC_LEQUAL:
|
|
g_string_append (glsl_shader_state->source, ">");
|
|
break;
|
|
case COGL_PIPELINE_ALPHA_FUNC_GREATER:
|
|
g_string_append (glsl_shader_state->source, "<=");
|
|
break;
|
|
case COGL_PIPELINE_ALPHA_FUNC_NOTEQUAL:
|
|
g_string_append (glsl_shader_state->source, "==");
|
|
break;
|
|
case COGL_PIPELINE_ALPHA_FUNC_GEQUAL:
|
|
g_string_append (glsl_shader_state->source, "< ");
|
|
break;
|
|
|
|
case COGL_PIPELINE_ALPHA_FUNC_ALWAYS:
|
|
case COGL_PIPELINE_ALPHA_FUNC_NEVER:
|
|
g_assert_not_reached ();
|
|
break;
|
|
}
|
|
|
|
g_string_append (glsl_shader_state->source,
|
|
" _cogl_alpha_test_ref)\n discard;\n");
|
|
}
|
|
|
|
#endif /* HAVE_COGL_GLES2 */
|
|
|
|
gboolean
|
|
_cogl_pipeline_fragend_glsl_end (CoglPipeline *pipeline,
|
|
unsigned long pipelines_difference)
|
|
{
|
|
GlslShaderState *glsl_shader_state = get_glsl_shader_state (pipeline);
|
|
|
|
_COGL_GET_CONTEXT (ctx, FALSE);
|
|
|
|
if (glsl_shader_state->source)
|
|
{
|
|
const char *source_strings[2];
|
|
GLint lengths[2];
|
|
GLint compile_status;
|
|
GLuint shader;
|
|
int n_tex_coord_attribs = 0;
|
|
int i, n_layers;
|
|
|
|
COGL_STATIC_COUNTER (fragend_glsl_compile_counter,
|
|
"glsl compile counter",
|
|
"Increments each time a new GLSL "
|
|
"program is compiled",
|
|
0 /* no application private data */);
|
|
COGL_COUNTER_INC (_cogl_uprof_context, fragend_glsl_compile_counter);
|
|
|
|
#ifdef HAVE_COGL_GLES2
|
|
add_alpha_test_snippet (pipeline, glsl_shader_state);
|
|
#endif
|
|
|
|
g_string_append (glsl_shader_state->source, "}\n");
|
|
|
|
if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_SHOW_SOURCE))
|
|
g_message ("pipeline program:\n%s%s",
|
|
glsl_shader_state->header->str,
|
|
glsl_shader_state->source->str);
|
|
|
|
GE_RET( shader, glCreateShader (GL_FRAGMENT_SHADER) );
|
|
|
|
lengths[0] = glsl_shader_state->header->len;
|
|
source_strings[0] = glsl_shader_state->header->str;
|
|
lengths[1] = glsl_shader_state->source->len;
|
|
source_strings[1] = glsl_shader_state->source->str;
|
|
|
|
/* Find the highest texture unit that is sampled to pass as the
|
|
number of texture coordinate attributes */
|
|
n_layers = cogl_pipeline_get_n_layers (pipeline);
|
|
for (i = 0; i < n_layers; i++)
|
|
if (glsl_shader_state->unit_state[i].sampled)
|
|
n_tex_coord_attribs = i + 1;
|
|
|
|
_cogl_shader_set_source_with_boilerplate (shader, GL_FRAGMENT_SHADER,
|
|
n_tex_coord_attribs,
|
|
2, /* count */
|
|
source_strings, lengths);
|
|
|
|
GE( glCompileShader (shader) );
|
|
GE( glGetShaderiv (shader, GL_COMPILE_STATUS, &compile_status) );
|
|
|
|
if (!compile_status)
|
|
{
|
|
GLint len = 0;
|
|
char *shader_log;
|
|
|
|
GE( glGetShaderiv (shader, GL_INFO_LOG_LENGTH, &len) );
|
|
shader_log = g_alloca (len);
|
|
GE( glGetShaderInfoLog (shader, len, &len, shader_log) );
|
|
g_warning ("Shader compilation failed:\n%s", shader_log);
|
|
}
|
|
|
|
glsl_shader_state->header = NULL;
|
|
glsl_shader_state->source = NULL;
|
|
glsl_shader_state->gl_shader = shader;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
_cogl_pipeline_fragend_glsl_pre_change_notify (CoglPipeline *pipeline,
|
|
CoglPipelineState change,
|
|
const CoglColor *new_color)
|
|
{
|
|
if ((change & COGL_PIPELINE_STATE_AFFECTS_FRAGMENT_CODEGEN))
|
|
dirty_glsl_shader_state (pipeline);
|
|
}
|
|
|
|
/* NB: layers are considered immutable once they have any dependants
|
|
* so although multiple pipelines can end up depending on a single
|
|
* static layer, we can guarantee that if a layer is being *changed*
|
|
* then it can only have one pipeline depending on it.
|
|
*
|
|
* XXX: Don't forget this is *pre* change, we can't read the new value
|
|
* yet!
|
|
*/
|
|
static void
|
|
_cogl_pipeline_fragend_glsl_layer_pre_change_notify (
|
|
CoglPipeline *owner,
|
|
CoglPipelineLayer *layer,
|
|
CoglPipelineLayerState change)
|
|
{
|
|
CoglPipelineFragendGlslPrivate *priv;
|
|
|
|
priv = get_glsl_priv (owner);
|
|
if (!priv)
|
|
return;
|
|
|
|
if ((change & COGL_PIPELINE_LAYER_STATE_AFFECTS_FRAGMENT_CODEGEN))
|
|
{
|
|
dirty_glsl_shader_state (owner);
|
|
return;
|
|
}
|
|
|
|
/* TODO: we could be saving snippets of texture combine code along
|
|
* with each layer and then when a layer changes we would just free
|
|
* the snippet. */
|
|
}
|
|
|
|
static void
|
|
_cogl_pipeline_fragend_glsl_free_priv (CoglPipeline *pipeline)
|
|
{
|
|
CoglPipelineFragendGlslPrivate *priv = get_glsl_priv (pipeline);
|
|
if (priv)
|
|
{
|
|
if (priv->glsl_shader_state)
|
|
glsl_shader_state_unref (priv->glsl_shader_state);
|
|
g_slice_free (CoglPipelineFragendGlslPrivate, priv);
|
|
set_glsl_priv (pipeline, NULL);
|
|
}
|
|
}
|
|
|
|
const CoglPipelineFragend _cogl_pipeline_glsl_fragend =
|
|
{
|
|
_cogl_pipeline_fragend_glsl_start,
|
|
_cogl_pipeline_fragend_glsl_add_layer,
|
|
_cogl_pipeline_fragend_glsl_passthrough,
|
|
_cogl_pipeline_fragend_glsl_end,
|
|
_cogl_pipeline_fragend_glsl_pre_change_notify,
|
|
NULL, /* pipeline_set_parent_notify */
|
|
_cogl_pipeline_fragend_glsl_layer_pre_change_notify,
|
|
_cogl_pipeline_fragend_glsl_free_priv,
|
|
};
|
|
|
|
#endif /* COGL_PIPELINE_FRAGEND_GLSL */
|
|
|