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mutter/cogl/driver/gl/cogl-pipeline-fragend-fixed.c
Robert Bragg 8f3380adc3 Clearly define 3 progends that own the frag+vertends 
This adds a new "fixed-arbfp" progend so we now have 3 distinct ways of
setting up the state of a pipeline:

  » fixed; where the vertex and fragment processing are implemented
    using fixed function opengl apis.
  » fixed-arbfp; where vertex processing is implemented using fixed
    function opengl apis but fragment processing is implemented
    using the ARB Fragment Processing language.
  » glsl; there vertex and fragment processing are both implemented
    using glsl.

This means we avoid unusual, combinations such as glsl for vertex
processing and arbfp for fragment processing, and also avoid pairing
fixed-function vertex processing with glsl fragment processing which we
happen to know hits some awkward code paths in Mesa that lead to poor
performance.

As part of this change, the progend now implies specific vertend and
fragend choices so instead of associating a vertend and fragend with a
pipeline we now just associate a progend choice.

When flushing a pipeline and choosing what progend to use, we now call a
progend->start() method that is able to determine if the vertend and
fragend together will be able to handle the given pipeline so the
vertend and fragend ->start() methods no longer need to return a boolean
status.

Since we now don't need to support glsl used in conjunction with fixed
function this will allow us to avoid ever using OpenGL builtin attribute
names, though this patch doesn't change that yet.

Reviewed-by: Neil Roberts <neil@linux.intel.com>

(cherry picked from commit cec381f50c7a2f2186bd4a8c5f38fecd5f099075)
2013-01-22 17:48:00 +00:00

428 lines
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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-context-private.h"
#include "cogl-pipeline-private.h"
#include "cogl-pipeline-state-private.h"
#include "cogl-pipeline-opengl-private.h"
#ifdef COGL_PIPELINE_FRAGEND_FIXED
#include "cogl-internal.h"
#include "cogl-context-private.h"
#include "cogl-object-private.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>
#ifndef GL_TEXTURE_RECTANGLE_ARB
#define GL_TEXTURE_RECTANGLE_ARB 0x84F5
#endif
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 void
_cogl_pipeline_fragend_fixed_start (CoglPipeline *pipeline,
int n_layers,
unsigned long pipelines_difference,
int n_tex_coord_attribs)
{
_cogl_use_fragment_program (0, COGL_PIPELINE_PROGRAM_TYPE_FIXED);
}
static void
translate_sources (CoglPipeline *pipeline,
int n_sources,
CoglPipelineCombineSource *source_in,
GLenum *source_out)
{
int i;
/* The texture source numbers specified in the layer combine are the
layer numbers so we need to map these to unit indices */
for (i = 0; i < n_sources; i++)
switch (source_in[i])
{
case COGL_PIPELINE_COMBINE_SOURCE_TEXTURE:
source_out[i] = GL_TEXTURE;
break;
case COGL_PIPELINE_COMBINE_SOURCE_CONSTANT:
source_out[i] = GL_CONSTANT;
break;
case COGL_PIPELINE_COMBINE_SOURCE_PRIMARY_COLOR:
source_out[i] = GL_PRIMARY_COLOR;
break;
case COGL_PIPELINE_COMBINE_SOURCE_PREVIOUS:
source_out[i] = GL_PREVIOUS;
break;
default:
{
int layer_num = source_in[i] - COGL_PIPELINE_COMBINE_SOURCE_TEXTURE0;
CoglPipelineGetLayerFlags flags = COGL_PIPELINE_GET_LAYER_NO_CREATE;
CoglPipelineLayer *layer =
_cogl_pipeline_get_layer_with_flags (pipeline, layer_num, flags);
if (layer == NULL)
{
static CoglBool warning_seen = FALSE;
if (!warning_seen)
{
g_warning ("The application is trying to use a texture "
"combine with a layer number that does not exist");
warning_seen = TRUE;
}
source_out[i] = GL_PREVIOUS;
}
else
source_out[i] = (_cogl_pipeline_layer_get_unit_index (layer) +
GL_TEXTURE0);
}
}
}
static CoglBool
_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 type */
if (layers_difference & COGL_PIPELINE_LAYER_STATE_TEXTURE_TYPE)
{
CoglTextureType texture_type =
_cogl_pipeline_layer_get_texture_type (layer);
GLenum gl_target;
switch (texture_type)
{
case COGL_TEXTURE_TYPE_2D:
gl_target = GL_TEXTURE_2D;
break;
case COGL_TEXTURE_TYPE_3D:
gl_target = GL_TEXTURE_3D;
break;
case COGL_TEXTURE_TYPE_RECTANGLE:
gl_target = GL_TEXTURE_RECTANGLE_ARB;
break;
}
_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;
GLenum sources[3];
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);
translate_sources (pipeline,
n_rgb_func_args,
big_state->texture_combine_rgb_src,
sources);
GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_RGB,
sources[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,
sources[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,
sources[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);
translate_sources (pipeline,
n_alpha_func_args,
big_state->texture_combine_alpha_src,
sources);
GE (ctx, glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_ALPHA,
sources[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,
sources[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,
sources[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 CoglBool
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 CoglBool
_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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