03dbf67ca4
There are several places where we need to compare the texture state of a pipeline and sometimes we need to take into consideration if the underlying texture has changed but other times we may only care to know if the texture target has changed. For example the fragends typically generate programs that they want to share with all pipelines with equivalent fragment processing state, and in this case when comparing pipelines we only care about the texture targets since changes to the underlying texture won't affect the programs generated. Prior to this we had tried to handle this by passing around some special flags to various functions that evaluate pipeline state to say when we do/don't care about the texture data, but this wasn't working in all cases and was more awkward to manage than the new approach. Now we simply have two state bits: COGL_PIPELINE_LAYER_STATE_TEXTURE_TARGET and COGL_PIPELINE_LAYER_STATE_TEXTURE_DATA and CoglPipelineLayer has an additional target member. Since all the appropriate code takes masks of these state bits to determine what to evaluate we don't need any extra magic flags.
419 lines
13 KiB
C
419 lines
13 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) 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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* 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 "cogl-pipeline-private.h"
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#include "cogl-pipeline-opengl-private.h"
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#ifdef COGL_PIPELINE_VERTEND_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-program-private.h"
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#include "cogl-pipeline-vertend-glsl-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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const CoglPipelineVertend _cogl_pipeline_glsl_vertend;
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typedef struct
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{
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unsigned int ref_count;
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GLuint gl_shader;
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GString *header, *source;
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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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} CoglPipelineVertendPrivate;
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static CoglUserDataKey glsl_priv_key;
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static CoglPipelineVertendPrivate *
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get_glsl_priv (CoglPipeline *pipeline)
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{
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return cogl_object_get_user_data (COGL_OBJECT (pipeline), &glsl_priv_key);
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}
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static void
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destroy_glsl_priv (void *user_data)
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{
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CoglPipelineVertendPrivate *priv = user_data;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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if (--priv->ref_count == 0)
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{
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if (priv->gl_shader)
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GE( glDeleteShader (priv->gl_shader) );
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g_slice_free (CoglPipelineVertendPrivate, priv);
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}
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}
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static void
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set_glsl_priv (CoglPipeline *pipeline, CoglPipelineVertendPrivate *priv)
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{
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cogl_object_set_user_data (COGL_OBJECT (pipeline),
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&glsl_priv_key,
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priv,
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destroy_glsl_priv);
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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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cogl_object_set_user_data (COGL_OBJECT (pipeline),
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&glsl_priv_key,
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NULL,
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destroy_glsl_priv);
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}
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GLuint
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_cogl_pipeline_vertend_glsl_get_shader (CoglPipeline *pipeline)
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{
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CoglPipelineVertendPrivate *priv = get_glsl_priv (pipeline);
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if (priv)
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return priv->gl_shader;
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else
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return 0;
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}
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static gboolean
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_cogl_pipeline_vertend_glsl_start (CoglPipeline *pipeline,
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int n_layers,
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unsigned long pipelines_difference)
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{
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CoglPipelineVertendPrivate *priv;
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CoglProgram *user_program;
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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 user program has a vertex shader that isn't GLSL then the
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appropriate vertend for that language should handle it */
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if (user_program &&
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_cogl_program_has_vertex_shader (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 == NULL)
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{
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CoglPipeline *authority;
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/* Get the authority for anything affecting vertex shader
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state */
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authority = _cogl_pipeline_find_equivalent_parent
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(pipeline,
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COGL_PIPELINE_STATE_AFFECTS_VERTEX_CODEGEN &
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~COGL_PIPELINE_STATE_LAYERS,
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COGL_PIPELINE_LAYER_STATE_AFFECTS_VERTEX_CODEGEN);
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priv = get_glsl_priv (authority);
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if (priv == NULL)
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{
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priv = g_slice_new0 (CoglPipelineVertendPrivate);
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priv->ref_count = 1;
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set_glsl_priv (authority, priv);
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}
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if (authority != pipeline)
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{
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priv->ref_count++;
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set_glsl_priv (pipeline, priv);
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}
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}
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if (priv->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->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->gl_shader) );
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priv->gl_shader = 0;
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}
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/* If we make it here then we have a priv struct without a gl_shader
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either because this is the first time we've encountered it or
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because the user program has changed */
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if (user_program)
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priv->user_program_age = user_program->age;
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/* If the user program contains a vertex 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_vertex_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->codegen_header_buffer, 0);
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g_string_set_size (ctx->codegen_source_buffer, 0);
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priv->header = ctx->codegen_header_buffer;
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priv->source = ctx->codegen_source_buffer;
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g_string_append (priv->source,
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"void\n"
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"main ()\n"
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"{\n");
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#ifdef HAVE_COGL_GLES2
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/* There is no builtin uniform for the pointsize on GLES2 so we need
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to copy it from the custom uniform in the vertex shader */
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g_string_append (priv->source,
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" cogl_point_size_out = cogl_point_size_in;\n");
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#else /* HAVE_COGL_GLES2 */
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/* On regular OpenGL we'll just flush the point size builtin */
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if (pipelines_difference & COGL_PIPELINE_STATE_POINT_SIZE)
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{
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CoglPipeline *authority =
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_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_POINT_SIZE);
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if (ctx->point_size_cache != authority->big_state->point_size)
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{
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GE( glPointSize (authority->big_state->point_size) );
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ctx->point_size_cache = authority->big_state->point_size;
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}
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}
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#endif /* HAVE_COGL_GLES2 */
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return TRUE;
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}
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static gboolean
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_cogl_pipeline_vertend_glsl_add_layer (CoglPipeline *pipeline,
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CoglPipelineLayer *layer,
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unsigned long layers_difference)
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{
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CoglPipelineVertendPrivate *priv;
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int unit_index;
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priv = get_glsl_priv (pipeline);
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unit_index = _cogl_pipeline_layer_get_unit_index (layer);
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#ifndef HAVE_COGL_GLES2
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/* We are using the fixed function uniforms for the user matrices
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and the only way to set them is with the fixed function API so we
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still need to flush them here */
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if (layers_difference & COGL_PIPELINE_LAYER_STATE_USER_MATRIX)
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{
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CoglPipelineLayerState state = COGL_PIPELINE_LAYER_STATE_USER_MATRIX;
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CoglPipelineLayer *authority =
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_cogl_pipeline_layer_get_authority (layer, state);
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CoglTextureUnit *unit = _cogl_get_texture_unit (unit_index);
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_cogl_matrix_stack_set (unit->matrix_stack,
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&authority->big_state->matrix);
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_cogl_matrix_stack_flush_to_gl (unit->matrix_stack, COGL_MATRIX_TEXTURE);
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}
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#endif /* HAVE_COGL_GLES2 */
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if (priv->source == NULL)
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return TRUE;
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/* Transform the texture coordinates by the layer's user matrix.
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*
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* FIXME: this should avoid doing the transform if there is no user
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* matrix set. This might need a separate layer state flag for
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* whether there is a user matrix
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*
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* FIXME: we could be more clever here and try to detect if the
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* fragment program is going to use the texture coordinates and
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* avoid setting them if not
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*/
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g_string_append_printf (priv->source,
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" cogl_tex_coord_out[%i] = "
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"cogl_texture_matrix[%i] * cogl_tex_coord%i_in;\n",
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unit_index, unit_index, unit_index);
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return TRUE;
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}
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static gboolean
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_cogl_pipeline_vertend_glsl_end (CoglPipeline *pipeline,
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unsigned long pipelines_difference)
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{
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CoglPipelineVertendPrivate *priv;
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_COGL_GET_CONTEXT (ctx, FALSE);
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priv = get_glsl_priv (pipeline);
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if (priv->source)
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{
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const char *source_strings[2];
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GLint lengths[2];
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GLint compile_status;
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GLuint shader;
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int n_layers;
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COGL_STATIC_COUNTER (vertend_glsl_compile_counter,
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"glsl vertex compile counter",
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"Increments each time a new GLSL "
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"vertex shader is compiled",
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0 /* no application private data */);
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COGL_COUNTER_INC (_cogl_uprof_context, vertend_glsl_compile_counter);
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g_string_append (priv->source,
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" cogl_position_out = "
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"cogl_modelview_projection_matrix * "
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"cogl_position_in;\n"
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" cogl_color_out = cogl_color_in;\n"
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"}\n");
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GE_RET( shader, glCreateShader (GL_VERTEX_SHADER) );
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lengths[0] = priv->header->len;
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source_strings[0] = priv->header->str;
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lengths[1] = priv->source->len;
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source_strings[1] = priv->source->str;
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n_layers = cogl_pipeline_get_n_layers (pipeline);
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_cogl_shader_set_source_with_boilerplate (shader, GL_VERTEX_SHADER,
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n_layers,
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2, /* count */
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source_strings, lengths);
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GE( glCompileShader (shader) );
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GE( glGetShaderiv (shader, GL_COMPILE_STATUS, &compile_status) );
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if (!compile_status)
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{
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GLint len = 0;
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char *shader_log;
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GE( glGetShaderiv (shader, GL_INFO_LOG_LENGTH, &len) );
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shader_log = g_alloca (len);
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GE( glGetShaderInfoLog (shader, len, &len, shader_log) );
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g_warning ("Shader compilation failed:\n%s", shader_log);
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}
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priv->header = NULL;
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priv->source = NULL;
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priv->gl_shader = shader;
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}
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return TRUE;
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}
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static void
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_cogl_pipeline_vertend_glsl_pre_change_notify (CoglPipeline *pipeline,
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CoglPipelineState change,
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const CoglColor *new_color)
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{
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if ((change & COGL_PIPELINE_STATE_AFFECTS_VERTEX_CODEGEN))
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dirty_glsl_shader_state (pipeline);
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}
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/* NB: layers are considered immutable once they have any dependants
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* so although multiple pipelines can end up depending on a single
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* static layer, we can guarantee that if a layer is being *changed*
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* then it can only have one pipeline depending on it.
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*
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* XXX: Don't forget this is *pre* change, we can't read the new value
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* yet!
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*/
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static void
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_cogl_pipeline_vertend_glsl_layer_pre_change_notify (
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CoglPipeline *owner,
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CoglPipelineLayer *layer,
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CoglPipelineLayerState change)
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{
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CoglPipelineVertendPrivate *priv;
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priv = get_glsl_priv (owner);
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if (!priv)
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return;
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if ((change & COGL_PIPELINE_LAYER_STATE_AFFECTS_VERTEX_CODEGEN))
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{
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dirty_glsl_shader_state (owner);
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return;
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}
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/* TODO: we could be saving snippets of texture combine code along
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* with each layer and then when a layer changes we would just free
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* the snippet. */
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}
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const CoglPipelineVertend _cogl_pipeline_glsl_vertend =
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{
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_cogl_pipeline_vertend_glsl_start,
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_cogl_pipeline_vertend_glsl_add_layer,
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_cogl_pipeline_vertend_glsl_end,
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_cogl_pipeline_vertend_glsl_pre_change_notify,
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_cogl_pipeline_vertend_glsl_layer_pre_change_notify
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};
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#endif /* COGL_PIPELINE_VERTEND_GLSL */
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