b2e735ff7f
The GL or GLES library is now dynamically loaded by the CoglRenderer so that it can choose between GL, GLES1 and GLES2 at runtime. The library is loaded by the renderer because it needs to be done before calling eglInitialize. There is a new environment variable called COGL_DRIVER to choose between gl, gles1 or gles2. The #ifdefs for HAVE_COGL_GL, HAVE_COGL_GLES and HAVE_COGL_GLES2 have been changed so that they don't assume the ifdefs are mutually exclusive. They haven't been removed entirely so that it's possible to compile the GLES backends without the the enums from the GL headers. When using GLX the winsys additionally dynamically loads libGL because that also contains the GLX API. It can't be linked in directly because that would probably conflict with the GLES API if the EGL is selected. When compiling with EGL support the library links directly to libEGL because it doesn't contain any GL API so it shouldn't have any conflicts. When building for WGL or OSX Cogl still directly links against the GL API so there is a #define in config.h so that Cogl won't try to dlopen the library. Cogl-pango previously had a #ifdef to detect when the GL backend is used so that it can sneakily pass GL_QUADS to cogl_vertex_buffer_draw. This is now changed so that it queries the CoglContext for the backend. However to get this to work Cogl now needs to export the _cogl_context_get_default symbol and cogl-pango needs some extra -I flags to so that it can include cogl-context-private.h
406 lines
12 KiB
C
406 lines
12 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-private.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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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( ctx, 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( ctx, 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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if (ctx->driver == COGL_DRIVER_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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/* On regular OpenGL we'll just flush the point size builtin */
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else 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( ctx, 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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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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_COGL_GET_CONTEXT (ctx, FALSE);
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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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if (ctx->driver != COGL_DRIVER_GLES2)
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{
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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_set_active_texture_unit (unit_index);
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_cogl_matrix_stack_flush_to_gl (unit->matrix_stack,
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COGL_MATRIX_TEXTURE);
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}
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}
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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, ctx, 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( ctx, glCompileShader (shader) );
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GE( ctx, 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( ctx, glGetShaderiv (shader, GL_INFO_LOG_LENGTH, &len) );
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shader_log = g_alloca (len);
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GE( ctx, 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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