1c449c67f6
This removes the need to maintain an array of tex_coord varyings and instead we now just emit a varying per-layer uniquely named using a layer_number infix like cogl_tex_coord0_out and cogl_tex_coord0_in. Notable this patch also had to change the journal flushing code to use pipeline layer numbers to determine the name of texture coordinate attributes. We now also break batches by using a deeper comparison of layers so such that two pipelines with the same number of layers can now cause a batch break if they use different layer numbers. This adds an internal _cogl_pipeline_layer_numbers_equal() function that takes two pipelines and returns TRUE if they have the same number of layers and all the layer numbers are the same too, otherwise it returns FALSE. Where we used to break batches based on changes to the number of layers we now break according to the status of _cogl_pipeline_layer_numbers_equal Reviewed-by: Neil Roberts <neil@linux.intel.com> (cherry picked from commit e55b64a9cdc93285049d9b969bef67484c2d9fb3) Note: this will cause a temporary regression for the Cogl 1.x CoglShader api since it will break compatibility with existing shaders that reference the texture varyings from the fragment shader. The intention is to follow up with another patch to add back CoglShader compatibility.
151 lines
5.5 KiB
C
151 lines
5.5 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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* Robert Bragg <robert@linux.intel.com>
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*/
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#ifndef __COGL_PIPELINE_OPENGL_PRIVATE_H
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#define __COGL_PIPELINE_OPENGL_PRIVATE_H
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#include "cogl-pipeline-private.h"
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#include "cogl-matrix-stack.h"
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/*
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* cogl-pipeline.c owns the GPU's texture unit state so we have some
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* private structures for describing the current state of a texture
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* unit that we track in a per context array (ctx->texture_units) that
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* grows according to the largest texture unit used so far...
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*
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* Roughly speaking the members in this structure are of two kinds:
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* either they are a low level reflection of the state we send to
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* OpenGL or they are for high level meta data assoicated with the
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* texture unit when flushing CoglPipelineLayers that is typically
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* used to optimize subsequent re-flushing of the same layer.
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*
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* The low level members are at the top, and the high level members
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* start with the .layer member.
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*/
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typedef struct _CoglTextureUnit
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{
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/* The base 0 texture unit index which can be used with
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* glActiveTexture () */
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int index;
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/* The GL target currently glEnabled or 0 if nothing is
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* enabled. This is only used by the fixed pipeline fragend */
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GLenum enabled_gl_target;
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/* The raw GL texture object name for which we called glBindTexture when
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* we flushed the last layer. (NB: The CoglTexture associated
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* with a layer may represent more than one GL texture) */
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GLuint gl_texture;
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/* The target of the GL texture object. This is just used so that we
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* can quickly determine the intended target to flush when
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* dirty_gl_texture == TRUE */
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GLenum gl_target;
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/* Foreign textures are those not created or deleted by Cogl. If we ever
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* call glBindTexture for a foreign texture then the next time we are
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* asked to glBindTexture we can't try and optimize a redundant state
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* change because we don't know if the original texture name was deleted
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* and now we are being asked to bind a recycled name. */
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CoglBool is_foreign;
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/* We have many components in Cogl that need to temporarily bind arbitrary
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* textures e.g. to query texture object parameters and since we don't
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* want that to result in too much redundant reflushing of layer state
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* when all that's needed is to re-bind the layer's gl_texture we use this
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* to track when the unit->gl_texture state is out of sync with the GL
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* texture object really bound too (GL_TEXTURE0+unit->index).
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*
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* XXX: as a further optimization cogl-pipeline.c uses a convention
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* of always using texture unit 1 for these transient bindings so we
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* can assume this is only ever TRUE for unit 1.
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*/
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CoglBool dirty_gl_texture;
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/* A matrix stack giving us the means to associate a texture
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* transform matrix with the texture unit. */
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CoglMatrixStack *matrix_stack;
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/*
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* Higher level layer state associated with the unit...
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*/
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/* The CoglPipelineLayer whos state was flushed to update this
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* texture unit last.
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*
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* This will be set to NULL if the layer is modified or freed which
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* means when we come to flush a layer; if this pointer is still
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* valid and == to the layer being flushed we don't need to update
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* any texture unit state. */
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CoglPipelineLayer *layer;
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/* To help minimize the state changes required we track the
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* difference flags associated with the layer whos state was last
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* flushed to update this texture unit.
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*
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* Note: we track this explicitly because .layer may get invalidated
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* if that layer is modified or deleted. Even if the layer is
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* invalidated though these flags can be used to optimize the state
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* flush of the next layer
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*/
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unsigned long layer_changes_since_flush;
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/* Whenever a CoglTexture's internal GL texture storage changes
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* cogl-pipeline.c is notified with a call to
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* _cogl_pipeline_texture_storage_change_notify which inturn sets
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* this to TRUE for each texture unit that it is currently bound
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* too. When we later come to flush some pipeline state then we will
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* always check this to potentially force an update of the texture
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* state even if the pipeline hasn't changed. */
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CoglBool texture_storage_changed;
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} CoglTextureUnit;
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CoglTextureUnit *
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_cogl_get_texture_unit (int index_);
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void
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_cogl_destroy_texture_units (void);
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void
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_cogl_set_active_texture_unit (int unit_index);
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void
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_cogl_bind_gl_texture_transient (GLenum gl_target,
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GLuint gl_texture,
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CoglBool is_foreign);
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void
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_cogl_delete_gl_texture (GLuint gl_texture);
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void
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_cogl_pipeline_flush_gl_state (CoglPipeline *pipeline,
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CoglFramebuffer *framebuffer,
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CoglBool skip_gl_state);
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#endif /* __COGL_PIPELINE_OPENGL_PRIVATE_H */
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