mirror of
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7fa04bb1a6
This adds back compatibility for CoglShaders that reference the cogl_tex_coord_in[] or cogl_tex_coord_out[] varyings. Unlike the previous way this was done this patch maintains the use of layer numbers for attributes and maintains forwards compatibility by letting shaders alternatively access the per-layer tex_coord varyings via cogl_tex_coord%i_in/out defines that index into the array.
504 lines
16 KiB
C
504 lines
16 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 <string.h>
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#include "cogl-context-private.h"
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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-internal.h"
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#include "cogl-context-private.h"
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#include "cogl-object-private.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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#include "cogl-pipeline-state-private.h"
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#include "cogl-glsl-shader-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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} CoglPipelineShaderState;
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static CoglUserDataKey shader_state_key;
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static CoglPipelineShaderState *
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shader_state_new (void)
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{
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CoglPipelineShaderState *shader_state;
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shader_state = g_slice_new0 (CoglPipelineShaderState);
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shader_state->ref_count = 1;
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return shader_state;
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}
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static CoglPipelineShaderState *
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get_shader_state (CoglPipeline *pipeline)
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{
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return cogl_object_get_user_data (COGL_OBJECT (pipeline), &shader_state_key);
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}
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static void
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destroy_shader_state (void *user_data)
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{
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CoglPipelineShaderState *shader_state = user_data;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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if (--shader_state->ref_count == 0)
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{
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if (shader_state->gl_shader)
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GE( ctx, glDeleteShader (shader_state->gl_shader) );
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g_slice_free (CoglPipelineShaderState, shader_state);
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}
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}
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static void
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set_shader_state (CoglPipeline *pipeline,
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CoglPipelineShaderState *shader_state)
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{
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cogl_object_set_user_data (COGL_OBJECT (pipeline),
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&shader_state_key,
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shader_state,
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destroy_shader_state);
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}
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static void
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dirty_shader_state (CoglPipeline *pipeline)
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{
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cogl_object_set_user_data (COGL_OBJECT (pipeline),
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&shader_state_key,
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NULL,
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NULL);
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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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CoglPipelineShaderState *shader_state = get_shader_state (pipeline);
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if (shader_state)
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return shader_state->gl_shader;
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else
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return 0;
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}
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static CoglPipelineSnippetList *
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get_vertex_snippets (CoglPipeline *pipeline)
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{
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pipeline =
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_cogl_pipeline_get_authority (pipeline,
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COGL_PIPELINE_STATE_VERTEX_SNIPPETS);
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return &pipeline->big_state->vertex_snippets;
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}
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static CoglPipelineSnippetList *
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get_layer_vertex_snippets (CoglPipelineLayer *layer)
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{
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unsigned long state = COGL_PIPELINE_LAYER_STATE_VERTEX_SNIPPETS;
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layer = _cogl_pipeline_layer_get_authority (layer, state);
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return &layer->big_state->vertex_snippets;
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}
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static void
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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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CoglPipelineShaderState *shader_state;
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CoglPipeline *template_pipeline = NULL;
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CoglProgram *user_program = cogl_pipeline_get_user_program (pipeline);
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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/* Now lookup our glsl backend private state (allocating if
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* necessary) */
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shader_state = get_shader_state (pipeline);
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if (shader_state == 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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shader_state = get_shader_state (authority);
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if (shader_state == NULL)
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{
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/* Check if there is already a similar cached pipeline whose
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shader state we can share */
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if (G_LIKELY (!(COGL_DEBUG_ENABLED
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(COGL_DEBUG_DISABLE_PROGRAM_CACHES))))
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{
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template_pipeline =
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_cogl_pipeline_cache_get_vertex_template (ctx->pipeline_cache,
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authority);
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shader_state = get_shader_state (template_pipeline);
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}
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if (shader_state)
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shader_state->ref_count++;
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else
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shader_state = shader_state_new ();
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set_shader_state (authority, shader_state);
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if (template_pipeline)
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{
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shader_state->ref_count++;
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set_shader_state (template_pipeline, shader_state);
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}
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}
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if (authority != pipeline)
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{
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shader_state->ref_count++;
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set_shader_state (pipeline, shader_state);
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}
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}
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if (user_program)
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{
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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 (_cogl_program_has_vertex_shader (user_program))
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{
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if (shader_state->gl_shader)
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{
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GE( ctx, glDeleteShader (shader_state->gl_shader) );
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shader_state->gl_shader = 0;
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}
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return;
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}
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}
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if (shader_state->gl_shader)
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return;
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/* If we make it here then we have a shader_state 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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/* 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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shader_state->header = ctx->codegen_header_buffer;
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shader_state->source = ctx->codegen_source_buffer;
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g_string_append (shader_state->source,
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"void\n"
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"cogl_generated_source ()\n"
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"{\n");
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if (!(ctx->private_feature_flags &
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COGL_PRIVATE_FEATURE_BUILTIN_POINT_SIZE_UNIFORM))
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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 (shader_state->source,
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" cogl_point_size_out = cogl_point_size_in;\n");
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}
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static CoglBool
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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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CoglFramebuffer *framebuffer)
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{
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CoglPipelineShaderState *shader_state;
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CoglPipelineSnippetData snippet_data;
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int layer_index = layer->index;
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_COGL_GET_CONTEXT (ctx, FALSE);
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shader_state = get_shader_state (pipeline);
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if (shader_state->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 (shader_state->header,
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"vec4\n"
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"cogl_real_transform_layer%i (mat4 matrix, "
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"vec4 tex_coord)\n"
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"{\n"
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" return matrix * tex_coord;\n"
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"}\n",
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layer_index);
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/* Wrap the layer code in any snippets that have been hooked */
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memset (&snippet_data, 0, sizeof (snippet_data));
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snippet_data.snippets = get_layer_vertex_snippets (layer);
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snippet_data.hook = COGL_SNIPPET_HOOK_TEXTURE_COORD_TRANSFORM;
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snippet_data.chain_function = g_strdup_printf ("cogl_real_transform_layer%i",
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layer_index);
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snippet_data.final_name = g_strdup_printf ("cogl_transform_layer%i",
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layer_index);
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snippet_data.function_prefix = g_strdup_printf ("cogl_transform_layer%i",
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layer_index);
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snippet_data.return_type = "vec4";
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snippet_data.return_variable = "cogl_tex_coord";
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snippet_data.return_variable_is_argument = TRUE;
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snippet_data.arguments = "cogl_matrix, cogl_tex_coord";
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snippet_data.argument_declarations = "mat4 cogl_matrix, vec4 cogl_tex_coord";
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snippet_data.source_buf = shader_state->header;
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_cogl_pipeline_snippet_generate_code (&snippet_data);
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g_free ((char *) snippet_data.chain_function);
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g_free ((char *) snippet_data.final_name);
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g_free ((char *) snippet_data.function_prefix);
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g_string_append_printf (shader_state->source,
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" cogl_tex_coord%i_out = "
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"cogl_transform_layer%i (cogl_texture_matrix%i,\n"
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" "
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" cogl_tex_coord%i_in);\n",
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layer_index,
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layer_index,
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layer_index,
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layer_index);
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return TRUE;
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}
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static CoglBool
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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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CoglPipelineShaderState *shader_state;
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_COGL_GET_CONTEXT (ctx, FALSE);
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shader_state = get_shader_state (pipeline);
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if (shader_state->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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CoglPipelineSnippetData snippet_data;
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CoglPipelineSnippetList *vertex_snippets;
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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 (shader_state->header,
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"void\n"
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"cogl_real_vertex_transform ()\n"
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"{\n"
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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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"}\n");
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g_string_append (shader_state->source,
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" cogl_vertex_transform ();\n"
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" cogl_color_out = cogl_color_in;\n"
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"}\n");
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vertex_snippets = get_vertex_snippets (pipeline);
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/* Add hooks for the vertex transform part */
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memset (&snippet_data, 0, sizeof (snippet_data));
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snippet_data.snippets = vertex_snippets;
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snippet_data.hook = COGL_SNIPPET_HOOK_VERTEX_TRANSFORM;
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snippet_data.chain_function = "cogl_real_vertex_transform";
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snippet_data.final_name = "cogl_vertex_transform";
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snippet_data.function_prefix = "cogl_vertex_transform";
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snippet_data.source_buf = shader_state->header;
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_cogl_pipeline_snippet_generate_code (&snippet_data);
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/* Add all of the hooks for vertex processing */
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memset (&snippet_data, 0, sizeof (snippet_data));
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snippet_data.snippets = vertex_snippets;
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snippet_data.hook = COGL_SNIPPET_HOOK_VERTEX;
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snippet_data.chain_function = "cogl_generated_source";
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snippet_data.final_name = "cogl_vertex_hook";
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snippet_data.function_prefix = "cogl_vertex_hook";
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snippet_data.source_buf = shader_state->source;
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_cogl_pipeline_snippet_generate_code (&snippet_data);
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g_string_append (shader_state->source,
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"void\n"
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"main ()\n"
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"{\n"
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" cogl_vertex_hook ();\n");
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/* If there are any snippets then we can't rely on the
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projection matrix to flip the rendering for offscreen buffers
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so we'll need to flip it using an extra statement and a
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uniform */
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if (_cogl_pipeline_has_vertex_snippets (pipeline))
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{
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g_string_append (shader_state->header,
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"uniform vec4 _cogl_flip_vector;\n");
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g_string_append (shader_state->source,
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" cogl_position_out *= _cogl_flip_vector;\n");
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}
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g_string_append (shader_state->source,
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"}\n");
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GE_RET( shader, ctx, glCreateShader (GL_VERTEX_SHADER) );
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lengths[0] = shader_state->header->len;
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source_strings[0] = shader_state->header->str;
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lengths[1] = shader_state->source->len;
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source_strings[1] = shader_state->source->str;
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_cogl_glsl_shader_set_source_with_boilerplate (ctx,
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NULL,
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shader, GL_VERTEX_SHADER,
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pipeline,
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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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shader_state->header = NULL;
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shader_state->source = NULL;
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shader_state->gl_shader = shader;
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}
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if ((ctx->private_feature_flags &
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COGL_PRIVATE_FEATURE_BUILTIN_POINT_SIZE_UNIFORM) &&
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(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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GE( ctx, glPointSize (authority->big_state->point_size) );
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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_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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CoglPipelineShaderState *shader_state;
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shader_state = get_shader_state (owner);
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if (!shader_state)
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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_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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