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mutter/cogl/cogl-pipeline-fragend-fixed.c
Neil Roberts d69d49fada pipeline: Unify how the backends store private data 
Previously the fragends had a separate private data pointer which was
used by the GLSL and ARBfp fragends to store a tiny struct containing
a single pointer to the ref-counted shader state. The space for the
private data pointer is reserved in all of the pipelines for all of
the potential backends. The vertends and progends however did this
differently by directly storing the pointer to the ref counted data
using cogl_object_set_user_data. This patch unifies the different
methods so that they all use cogl_object_set_user_data and the
fragends don't bother with the separate tiny allocation for the
private data. The private data pointer array has been removed from
CoglPipeline and the corresponding fragend virtual to free the private
data has also been removed because this can instead be done with the
destroy notify from the object user data.

The variable names used have been unified so that all of the vertends
and fragends name their data struct CoglPipelineShaderState and use a
variable called shader_state to refer to it. The progend uses
CoglPipelineProgramState and a variable called program_state.

This should also fix two potential bugs. the ARBfp fragend was
apprently leaking a reference to the private state when it creates the
private data because it was adding a reference before stroring the
pointer to the newly allocated data but the ref count is already set
to 1 on creation. The other potential bug is that the free function
for CoglPipeline was only calling the free_priv virtual for the
currently used fragend of the pipeline. The design of the fragends is
meant to allow a pipeline to have multiple fragend priv datas because
a child pipeline could be attaching its fragend data to the ancestor
and its allowed to pick a different fragend.
2011-07-13 12:30:07 +01:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2008,2009,2010 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*
*
* Authors:
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl-pipeline-private.h"
#include "cogl-pipeline-opengl-private.h"
#ifdef COGL_PIPELINE_FRAGEND_FIXED
#include "cogl.h"
#include "cogl-internal.h"
#include "cogl-context-private.h"
#include "cogl-handle.h"
#include "cogl-texture-private.h"
#include "cogl-blend-string.h"
#include "cogl-profile.h"
#include "cogl-program-private.h"
#include <glib.h>
#include <glib/gprintf.h>
#include <string.h>
const CoglPipelineFragend _cogl_pipeline_fixed_fragend;
static void
_cogl_disable_texture_unit (int unit_index)
{
CoglTextureUnit *unit;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
unit = &g_array_index (ctx->texture_units, CoglTextureUnit, unit_index);
if (unit->enabled_gl_target)
{
_cogl_set_active_texture_unit (unit_index);
GE (ctx, glDisable (unit->enabled_gl_target));
unit->enabled_gl_target = 0;
}
}
static int
get_max_texture_units (void)
{
_COGL_GET_CONTEXT (ctx, 0);
/* This function is called quite often so we cache the value to
avoid too many GL calls */
if (ctx->max_texture_units == -1)
{
ctx->max_texture_units = 1;
GE (ctx, glGetIntegerv (GL_MAX_TEXTURE_UNITS,
&ctx->max_texture_units));
}
return ctx->max_texture_units;
}
static gboolean
_cogl_pipeline_fragend_fixed_start (CoglPipeline *pipeline,
int n_layers,
unsigned long pipelines_difference,
int n_tex_coord_attribs)
{
CoglHandle user_program;
_COGL_GET_CONTEXT (ctx, FALSE);
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_FIXED)))
return FALSE;
if (ctx->driver == COGL_DRIVER_GLES2)
return FALSE;
/* If there is a user program with a fragment shader then the
appropriate backend for that language should handle it. We can
still use the fixed fragment backend if the program only contains
a vertex shader */
user_program = cogl_pipeline_get_user_program (pipeline);
if (user_program != COGL_INVALID_HANDLE &&
_cogl_program_has_fragment_shader (user_program))
return FALSE;
_cogl_use_fragment_program (0, COGL_PIPELINE_PROGRAM_TYPE_FIXED);
return TRUE;
}
static gboolean
_cogl_pipeline_fragend_fixed_add_layer (CoglPipeline *pipeline,
CoglPipelineLayer *layer,
unsigned long layers_difference)
{
CoglTextureUnit *unit =
_cogl_get_texture_unit (_cogl_pipeline_layer_get_unit_index (layer));
int unit_index = unit->index;
int n_rgb_func_args;
int n_alpha_func_args;
_COGL_GET_CONTEXT (ctx, FALSE);
/* XXX: Beware that since we are changing the active texture unit we
* must make sure we don't call into other Cogl components that may
* temporarily bind texture objects to query/modify parameters since
* they will end up binding texture unit 1. See
* _cogl_bind_gl_texture_transient for more details.
*/
_cogl_set_active_texture_unit (unit_index);
if (G_UNLIKELY (unit_index >= get_max_texture_units ()))
{
_cogl_disable_texture_unit (unit_index);
/* TODO: although this isn't considered an error that
* warrants falling back to a different backend we
* should print a warning here. */
return TRUE;
}
/* Handle enabling or disabling the right texture target */
if (layers_difference & COGL_PIPELINE_LAYER_STATE_TEXTURE_TARGET)
{
CoglPipelineLayer *tex_authority =
_cogl_pipeline_layer_get_authority (layer,
COGL_PIPELINE_LAYER_STATE_TEXTURE_DATA);
CoglPipelineLayer *target_authority =
_cogl_pipeline_layer_get_authority (layer,
COGL_PIPELINE_LAYER_STATE_TEXTURE_TARGET);
/* XXX: currently layers with no associated texture fallback to
* using ctx->default_gl_texture_2d_tex so they have a texture
* target of GL_TEXTURE_2D */
GLenum gl_target =
tex_authority->texture ? target_authority->target : GL_TEXTURE_2D;
_cogl_set_active_texture_unit (unit_index);
/* The common GL code handles binding the right texture so we
just need to handle enabling and disabling it */
if (unit->enabled_gl_target != gl_target)
{
/* Disable the previous target if it's still enabled */
if (unit->enabled_gl_target)
GE (ctx, glDisable (unit->enabled_gl_target));
/* Enable the new target */
if (!G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_TEXTURING)))
{
GE (ctx, glEnable (gl_target));
unit->enabled_gl_target = gl_target;
}
}
}
else
{
/* Even though there may be no difference between the last flushed
* texture state and the current layers texture state it may be that the
* texture unit has been disabled for some time so we need to assert that
* it's enabled now.
*/
if (!G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_TEXTURING)) &&
unit->enabled_gl_target == 0)
{
_cogl_set_active_texture_unit (unit_index);
GE (ctx, glEnable (unit->gl_target));
unit->enabled_gl_target = unit->gl_target;
}
}
if (layers_difference & COGL_PIPELINE_LAYER_STATE_COMBINE)
{
CoglPipelineLayer *authority =
_cogl_pipeline_layer_get_authority (layer,
COGL_PIPELINE_LAYER_STATE_COMBINE);
CoglPipelineLayerBigState *big_state = authority->big_state;
GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE));
/* Set the combiner functions... */
GE (ctx, glTexEnvi (GL_TEXTURE_ENV,
GL_COMBINE_RGB,
big_state->texture_combine_rgb_func));
GE (ctx, glTexEnvi (GL_TEXTURE_ENV,
GL_COMBINE_ALPHA,
big_state->texture_combine_alpha_func));
/*
* Setup the function arguments...
*/
/* For the RGB components... */
n_rgb_func_args =
_cogl_get_n_args_for_combine_func (big_state->texture_combine_rgb_func);
GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_RGB,
big_state->texture_combine_rgb_src[0]));
GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB,
big_state->texture_combine_rgb_op[0]));
if (n_rgb_func_args > 1)
{
GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_SRC1_RGB,
big_state->texture_combine_rgb_src[1]));
GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_RGB,
big_state->texture_combine_rgb_op[1]));
}
if (n_rgb_func_args > 2)
{
GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_SRC2_RGB,
big_state->texture_combine_rgb_src[2]));
GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND2_RGB,
big_state->texture_combine_rgb_op[2]));
}
/* For the Alpha component */
n_alpha_func_args =
_cogl_get_n_args_for_combine_func (big_state->texture_combine_alpha_func);
GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_ALPHA,
big_state->texture_combine_alpha_src[0]));
GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_ALPHA,
big_state->texture_combine_alpha_op[0]));
if (n_alpha_func_args > 1)
{
GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_SRC1_ALPHA,
big_state->texture_combine_alpha_src[1]));
GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_ALPHA,
big_state->texture_combine_alpha_op[1]));
}
if (n_alpha_func_args > 2)
{
GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_SRC2_ALPHA,
big_state->texture_combine_alpha_src[2]));
GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND2_ALPHA,
big_state->texture_combine_alpha_op[2]));
}
}
if (layers_difference & COGL_PIPELINE_LAYER_STATE_COMBINE_CONSTANT)
{
CoglPipelineLayer *authority =
_cogl_pipeline_layer_get_authority
(layer, COGL_PIPELINE_LAYER_STATE_COMBINE_CONSTANT);
CoglPipelineLayerBigState *big_state = authority->big_state;
GE (ctx, glTexEnvfv (GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR,
big_state->texture_combine_constant));
}
return TRUE;
}
static gboolean
get_highest_unit_index_cb (CoglPipelineLayer *layer,
void *user_data)
{
int unit_index = _cogl_pipeline_layer_get_unit_index (layer);
int *highest_index = user_data;
*highest_index = unit_index;
return TRUE;
}
static gboolean
_cogl_pipeline_fragend_fixed_end (CoglPipeline *pipeline,
unsigned long pipelines_difference)
{
int highest_unit_index = -1;
int i;
_COGL_GET_CONTEXT (ctx, FALSE);
_cogl_pipeline_foreach_layer_internal (pipeline,
get_highest_unit_index_cb,
&highest_unit_index);
/* Disable additional texture units that may have previously been in use.. */
for (i = highest_unit_index + 1; i < ctx->texture_units->len; i++)
_cogl_disable_texture_unit (i);
if (pipelines_difference & COGL_PIPELINE_STATE_FOG)
{
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_FOG);
CoglPipelineFogState *fog_state = &authority->big_state->fog_state;
if (fog_state->enabled)
{
GLfloat fogColor[4];
GLenum gl_mode = GL_LINEAR;
fogColor[0] = cogl_color_get_red_float (&fog_state->color);
fogColor[1] = cogl_color_get_green_float (&fog_state->color);
fogColor[2] = cogl_color_get_blue_float (&fog_state->color);
fogColor[3] = cogl_color_get_alpha_float (&fog_state->color);
GE (ctx, glEnable (GL_FOG));
GE (ctx, glFogfv (GL_FOG_COLOR, fogColor));
if (ctx->driver == COGL_DRIVER_GLES1)
switch (fog_state->mode)
{
case COGL_FOG_MODE_LINEAR:
gl_mode = GL_LINEAR;
break;
case COGL_FOG_MODE_EXPONENTIAL:
gl_mode = GL_EXP;
break;
case COGL_FOG_MODE_EXPONENTIAL_SQUARED:
gl_mode = GL_EXP2;
break;
}
/* TODO: support other modes for GLES2 */
/* NB: GLES doesn't have glFogi */
GE (ctx, glFogf (GL_FOG_MODE, gl_mode));
GE (ctx, glHint (GL_FOG_HINT, GL_NICEST));
GE (ctx, glFogf (GL_FOG_DENSITY, fog_state->density));
GE (ctx, glFogf (GL_FOG_START, fog_state->z_near));
GE (ctx, glFogf (GL_FOG_END, fog_state->z_far));
}
else
GE (ctx, glDisable (GL_FOG));
}
return TRUE;
}
const CoglPipelineFragend _cogl_pipeline_fixed_fragend =
{
_cogl_pipeline_fragend_fixed_start,
_cogl_pipeline_fragend_fixed_add_layer,
NULL, /* passthrough */
_cogl_pipeline_fragend_fixed_end,
NULL, /* pipeline_change_notify */
NULL, /* pipeline_set_parent_notify */
NULL, /* layer_change_notify */
};
#endif /* COGL_PIPELINE_FRAGEND_FIXED */
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