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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.
367 lines
12 KiB
C
367 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) 2008,2009,2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*
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*
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* Authors:
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* Robert Bragg <robert@linux.intel.com>
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*/
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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_FRAGEND_FIXED
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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-texture-private.h"
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#include "cogl-blend-string.h"
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#include "cogl-profile.h"
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#include "cogl-program-private.h"
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#include <glib.h>
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#include <glib/gprintf.h>
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#include <string.h>
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const CoglPipelineFragend _cogl_pipeline_fixed_fragend;
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static void
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_cogl_disable_texture_unit (int unit_index)
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{
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CoglTextureUnit *unit;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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unit = &g_array_index (ctx->texture_units, CoglTextureUnit, unit_index);
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if (unit->enabled_gl_target)
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{
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_cogl_set_active_texture_unit (unit_index);
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GE (glDisable (unit->enabled_gl_target));
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unit->enabled_gl_target = 0;
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}
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}
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static int
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get_max_texture_units (void)
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{
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_COGL_GET_CONTEXT (ctx, 0);
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/* This function is called quite often so we cache the value to
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avoid too many GL calls */
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if (ctx->max_texture_units == -1)
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{
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ctx->max_texture_units = 1;
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GE (glGetIntegerv (GL_MAX_TEXTURE_UNITS,
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&ctx->max_texture_units));
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}
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return ctx->max_texture_units;
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}
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static gboolean
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_cogl_pipeline_fragend_fixed_start (CoglPipeline *pipeline,
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int n_layers,
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unsigned long pipelines_difference,
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int n_tex_coord_attribs)
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{
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CoglHandle user_program;
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if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DISABLE_FIXED))
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return FALSE;
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/* If there is a user program with a fragment shader then the
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appropriate backend for that language should handle it. We can
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still use the fixed fragment backend if the program only contains
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a vertex shader */
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user_program = cogl_pipeline_get_user_program (pipeline);
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if (user_program != COGL_INVALID_HANDLE &&
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_cogl_program_has_fragment_shader (user_program))
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return FALSE;
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_cogl_use_fragment_program (0, COGL_PIPELINE_PROGRAM_TYPE_FIXED);
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return TRUE;
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}
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static gboolean
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_cogl_pipeline_fragend_fixed_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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CoglTextureUnit *unit =
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_cogl_get_texture_unit (_cogl_pipeline_layer_get_unit_index (layer));
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int unit_index = unit->index;
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int n_rgb_func_args;
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int n_alpha_func_args;
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_COGL_GET_CONTEXT (ctx, FALSE);
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/* XXX: Beware that since we are changing the active texture unit we
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* must make sure we don't call into other Cogl components that may
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* temporarily bind texture objects to query/modify parameters since
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* they will end up binding texture unit 1. See
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* _cogl_bind_gl_texture_transient for more details.
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*/
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_cogl_set_active_texture_unit (unit_index);
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if (G_UNLIKELY (unit_index >= get_max_texture_units ()))
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{
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_cogl_disable_texture_unit (unit_index);
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/* TODO: although this isn't considered an error that
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* warrants falling back to a different backend we
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* should print a warning here. */
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return TRUE;
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}
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/* Handle enabling or disabling the right texture target */
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if (layers_difference & COGL_PIPELINE_LAYER_STATE_TEXTURE_TARGET)
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{
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CoglPipelineLayer *tex_authority =
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_cogl_pipeline_layer_get_authority (layer,
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COGL_PIPELINE_LAYER_STATE_TEXTURE_DATA);
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CoglPipelineLayer *target_authority =
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_cogl_pipeline_layer_get_authority (layer,
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COGL_PIPELINE_LAYER_STATE_TEXTURE_TARGET);
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/* XXX: currently layers with no associated texture fallback to
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* using ctx->default_gl_texture_2d_tex so they have a texture
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* target of GL_TEXTURE_2D */
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GLenum gl_target =
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tex_authority->texture ? target_authority->target : GL_TEXTURE_2D;
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_cogl_set_active_texture_unit (unit_index);
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/* The common GL code handles binding the right texture so we
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just need to handle enabling and disabling it */
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if (unit->enabled_gl_target != gl_target)
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{
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/* Disable the previous target if it's still enabled */
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if (unit->enabled_gl_target)
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GE (glDisable (unit->enabled_gl_target));
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/* Enable the new target */
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if (!G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DISABLE_TEXTURING))
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{
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GE (glEnable (gl_target));
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unit->enabled_gl_target = gl_target;
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}
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}
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}
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else
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{
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/* Even though there may be no difference between the last flushed
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* texture state and the current layers texture state it may be that the
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* texture unit has been disabled for some time so we need to assert that
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* it's enabled now.
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*/
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if (!G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DISABLE_TEXTURING) &&
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!unit->enabled_gl_target == 0)
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{
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_cogl_set_active_texture_unit (unit_index);
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GE (glEnable (unit->gl_target));
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unit->enabled_gl_target = unit->gl_target;
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}
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}
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if (layers_difference & COGL_PIPELINE_LAYER_STATE_COMBINE)
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{
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CoglPipelineLayer *authority =
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_cogl_pipeline_layer_get_authority (layer,
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COGL_PIPELINE_LAYER_STATE_COMBINE);
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CoglPipelineLayerBigState *big_state = authority->big_state;
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE));
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/* Set the combiner functions... */
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GE (glTexEnvi (GL_TEXTURE_ENV,
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GL_COMBINE_RGB,
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big_state->texture_combine_rgb_func));
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GE (glTexEnvi (GL_TEXTURE_ENV,
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GL_COMBINE_ALPHA,
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big_state->texture_combine_alpha_func));
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/*
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* Setup the function arguments...
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*/
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/* For the RGB components... */
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n_rgb_func_args =
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_cogl_get_n_args_for_combine_func (big_state->texture_combine_rgb_func);
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_RGB,
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big_state->texture_combine_rgb_src[0]));
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB,
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big_state->texture_combine_rgb_op[0]));
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if (n_rgb_func_args > 1)
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{
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC1_RGB,
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big_state->texture_combine_rgb_src[1]));
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_RGB,
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big_state->texture_combine_rgb_op[1]));
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}
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if (n_rgb_func_args > 2)
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{
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC2_RGB,
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big_state->texture_combine_rgb_src[2]));
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND2_RGB,
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big_state->texture_combine_rgb_op[2]));
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}
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/* For the Alpha component */
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n_alpha_func_args =
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_cogl_get_n_args_for_combine_func (big_state->texture_combine_alpha_func);
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_ALPHA,
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big_state->texture_combine_alpha_src[0]));
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_ALPHA,
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big_state->texture_combine_alpha_op[0]));
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if (n_alpha_func_args > 1)
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{
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC1_ALPHA,
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big_state->texture_combine_alpha_src[1]));
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_ALPHA,
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big_state->texture_combine_alpha_op[1]));
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}
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if (n_alpha_func_args > 2)
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{
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC2_ALPHA,
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big_state->texture_combine_alpha_src[2]));
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND2_ALPHA,
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big_state->texture_combine_alpha_op[2]));
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}
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}
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if (layers_difference & COGL_PIPELINE_LAYER_STATE_COMBINE_CONSTANT)
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{
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CoglPipelineLayer *authority =
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_cogl_pipeline_layer_get_authority
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(layer, COGL_PIPELINE_LAYER_STATE_COMBINE_CONSTANT);
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CoglPipelineLayerBigState *big_state = authority->big_state;
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GE (glTexEnvfv (GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR,
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big_state->texture_combine_constant));
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}
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return TRUE;
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}
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static gboolean
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get_highest_unit_index_cb (CoglPipelineLayer *layer,
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void *user_data)
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{
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int unit_index = _cogl_pipeline_layer_get_unit_index (layer);
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int *highest_index = user_data;
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*highest_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_fragend_fixed_end (CoglPipeline *pipeline,
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unsigned long pipelines_difference)
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{
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int highest_unit_index = -1;
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int i;
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_COGL_GET_CONTEXT (ctx, FALSE);
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_cogl_pipeline_foreach_layer_internal (pipeline,
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get_highest_unit_index_cb,
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&highest_unit_index);
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/* Disable additional texture units that may have previously been in use.. */
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for (i = highest_unit_index + 1; i < ctx->texture_units->len; i++)
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_cogl_disable_texture_unit (i);
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if (pipelines_difference & COGL_PIPELINE_STATE_FOG)
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{
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CoglPipeline *authority =
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_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_FOG);
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CoglPipelineFogState *fog_state = &authority->big_state->fog_state;
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if (fog_state->enabled)
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{
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GLfloat fogColor[4];
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GLenum gl_mode = GL_LINEAR;
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fogColor[0] = cogl_color_get_red_float (&fog_state->color);
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fogColor[1] = cogl_color_get_green_float (&fog_state->color);
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fogColor[2] = cogl_color_get_blue_float (&fog_state->color);
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fogColor[3] = cogl_color_get_alpha_float (&fog_state->color);
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GE (glEnable (GL_FOG));
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GE (glFogfv (GL_FOG_COLOR, fogColor));
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#if HAVE_COGL_GLES
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switch (fog_state->mode)
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{
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case COGL_FOG_MODE_LINEAR:
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gl_mode = GL_LINEAR;
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break;
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case COGL_FOG_MODE_EXPONENTIAL:
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gl_mode = GL_EXP;
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break;
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case COGL_FOG_MODE_EXPONENTIAL_SQUARED:
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gl_mode = GL_EXP2;
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break;
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}
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#endif
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/* TODO: support other modes for GLES2 */
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/* NB: GLES doesn't have glFogi */
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GE (glFogf (GL_FOG_MODE, gl_mode));
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GE (glHint (GL_FOG_HINT, GL_NICEST));
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GE (glFogf (GL_FOG_DENSITY, fog_state->density));
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GE (glFogf (GL_FOG_START, fog_state->z_near));
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GE (glFogf (GL_FOG_END, fog_state->z_far));
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}
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else
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GE (glDisable (GL_FOG));
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}
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return TRUE;
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}
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const CoglPipelineFragend _cogl_pipeline_fixed_fragend =
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{
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_cogl_pipeline_fragend_fixed_start,
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_cogl_pipeline_fragend_fixed_add_layer,
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NULL, /* passthrough */
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_cogl_pipeline_fragend_fixed_end,
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NULL, /* pipeline_change_notify */
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NULL, /* pipeline_set_parent_notify */
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NULL, /* layer_change_notify */
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NULL /* free_priv */
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};
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#endif /* COGL_PIPELINE_FRAGEND_FIXED */
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