isa/mutter
1
0
Fork 0
mirror of https://github.com/brl/mutter.git synced 2024-12-24 12:02:04 +00:00
Code Issues Packages Projects Releases Wiki Activity
791773987c
mutter/cogl/cogl-pipeline-fragend-glsl.c
Robert Bragg 4c3dadd35e Add a strong CoglTexture type to replace CoglHandle 
As part of the on going, incremental effort to purge the non type safe
CoglHandle type from the Cogl API this patch tackles most of the
CoglHandle uses relating to textures.

We'd postponed making this change for quite a while because we wanted to
have a clearer understanding of how we wanted to evolve the texture APIs
towards Cogl 2.0 before exposing type safety here which would be
difficult to change later since it would imply breaking APIs.

The basic idea that we are steering towards now is that CoglTexture
can be considered to be the most primitive interface we have for any
object representing a texture. The texture interface would provide
roughly these methods:

  cogl_texture_get_width
  cogl_texture_get_height
  cogl_texture_can_repeat
  cogl_texture_can_mipmap
  cogl_texture_generate_mipmap;
  cogl_texture_get_format
  cogl_texture_set_region
  cogl_texture_get_region

Besides the texture interface we will then start to expose types
corresponding to specific texture types: CoglTexture2D,
CoglTexture3D, CoglTexture2DSliced, CoglSubTexture, CoglAtlasTexture and
CoglTexturePixmapX11.

We will then also expose an interface for the high-level texture types
we have (such as CoglTexture2DSlice, CoglSubTexture and
CoglAtlasTexture) called CoglMetaTexture. CoglMetaTexture is an
additional interface that lets you iterate a virtual region of a meta
texture and get mappings of primitive textures to sub-regions of that
virtual region. Internally we already have this kind of abstraction for
dealing with sliced texture, sub-textures and atlas textures in a
consistent way, so this will just make that abstraction public. The aim
here is to clarify that there is a difference between primitive textures
(CoglTexture2D/3D) and some of the other high-level textures, and also
enable developers to implement primitives that can support meta textures
since they can only be used with the cogl_rectangle API currently.

The thing that's not so clean-cut with this are the texture constructors
we have currently; such as cogl_texture_new_from_file which no longer
make sense when CoglTexture is considered to be an interface.  These
will basically just become convenient factory functions and it's just a
bit unusual that they are within the cogl_texture namespace.  It's worth
noting here that all the texture type APIs will also have their own type
specific constructors so these functions will only be used for the
convenience of being able to create a texture without really wanting to
know the details of what type of texture you need.  Longer term for 2.0
we may come up with replacement names for these factory functions or the
other thing we are considering is designing some asynchronous factory
functions instead since it's so often detrimental to application
performance to be blocked waiting for a texture to be uploaded to the
GPU.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
2011-09-21 15:27:03 +01:00

1007 lines
32 KiB
C
Raw Blame History

/*
* 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>
* Neil Roberts <neil@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "cogl-pipeline-private.h"
#include "cogl-shader-private.h"
#include "cogl-blend-string.h"
#ifdef COGL_PIPELINE_FRAGEND_GLSL
#include "cogl.h"
#include "cogl-internal.h"
#include "cogl-context-private.h"
#include "cogl-handle.h"
#include "cogl-shader-private.h"
#include "cogl-program-private.h"
#include "cogl-pipeline-cache.h"
#include <glib.h>
/*
* GL/GLES compatability defines for pipeline thingies:
*/
/* This might not be defined on GLES */
#ifndef GL_TEXTURE_3D
#define GL_TEXTURE_3D 0x806F
#endif
const CoglPipelineFragend _cogl_pipeline_glsl_backend;
typedef struct _UnitState
{
unsigned int sampled:1;
unsigned int combine_constant_used:1;
} UnitState;
typedef struct _LayerData LayerData;
COGL_LIST_HEAD (LayerDataList, LayerData);
struct _LayerData
{
COGL_LIST_ENTRY (LayerData) list_node;
/* Layer index for the for the previous layer. This isn't
necessarily the same as this layer's index - 1 because the
indices can have gaps. If this is the first layer then it will be
-1 */
int previous_layer_index;
CoglPipelineLayer *layer;
};
typedef struct
{
int ref_count;
GLuint gl_shader;
GString *header, *source;
UnitState *unit_state;
/* List of layers that we haven't generated code for yet. These are
in reverse order. As soon as we're about to generate code for
layer we'll remove it from the list so we don't generate it
again */
LayerDataList layers;
/* Age of the user program that was current when the shader was
generated. We need to keep track of this because if the user
program changes then we may need to redecide whether to generate
a shader at all */
unsigned int user_program_age;
} CoglPipelineShaderState;
static CoglUserDataKey shader_state_key;
static void
ensure_layer_generated (CoglPipeline *pipeline,
int layer_num);
static CoglPipelineShaderState *
shader_state_new (int n_layers)
{
CoglPipelineShaderState *shader_state;
shader_state = g_slice_new0 (CoglPipelineShaderState);
shader_state->ref_count = 1;
shader_state->unit_state = g_new0 (UnitState, n_layers);
return shader_state;
}
static CoglPipelineShaderState *
get_shader_state (CoglPipeline *pipeline)
{
return cogl_object_get_user_data (COGL_OBJECT (pipeline), &shader_state_key);
}
static void
destroy_shader_state (void *user_data)
{
CoglPipelineShaderState *shader_state = user_data;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (--shader_state->ref_count == 0)
{
if (shader_state->gl_shader)
GE( ctx, glDeleteShader (shader_state->gl_shader) );
g_free (shader_state->unit_state);
g_slice_free (CoglPipelineShaderState, shader_state);
}
}
static void
set_shader_state (CoglPipeline *pipeline, CoglPipelineShaderState *shader_state)
{
cogl_object_set_user_data (COGL_OBJECT (pipeline),
&shader_state_key,
shader_state,
destroy_shader_state);
}
static void
dirty_shader_state (CoglPipeline *pipeline)
{
cogl_object_set_user_data (COGL_OBJECT (pipeline),
&shader_state_key,
NULL,
NULL);
}
GLuint
_cogl_pipeline_fragend_glsl_get_shader (CoglPipeline *pipeline)
{
CoglPipelineShaderState *shader_state = get_shader_state (pipeline);
if (shader_state)
return shader_state->gl_shader;
else
return 0;
}
static gboolean
_cogl_pipeline_fragend_glsl_start (CoglPipeline *pipeline,
int n_layers,
unsigned long pipelines_difference,
int n_tex_coord_attribs)
{
CoglPipelineShaderState *shader_state;
CoglPipeline *authority;
CoglPipeline *template_pipeline = NULL;
CoglProgram *user_program;
int i;
_COGL_GET_CONTEXT (ctx, FALSE);
if (!cogl_features_available (COGL_FEATURE_SHADERS_GLSL))
return FALSE;
user_program = cogl_pipeline_get_user_program (pipeline);
/* If the user fragment shader isn't GLSL then we should let
another backend handle it */
if (user_program &&
_cogl_program_has_fragment_shader (user_program) &&
_cogl_program_get_language (user_program) != COGL_SHADER_LANGUAGE_GLSL)
return FALSE;
/* Now lookup our glsl backend private state */
shader_state = get_shader_state (pipeline);
if (shader_state == NULL)
{
/* If we don't have an associated glsl shader yet then find the
* glsl-authority (the oldest ancestor whose state will result in
* the same shader being generated as for this pipeline).
*
* We always make sure to associate new shader with the
* glsl-authority to maximize the chance that other pipelines can
* share it.
*/
authority = _cogl_pipeline_find_equivalent_parent
(pipeline,
_cogl_pipeline_get_state_for_fragment_codegen (ctx) &
~COGL_PIPELINE_STATE_LAYERS,
_cogl_pipeline_get_layer_state_for_fragment_codegen (ctx));
shader_state = get_shader_state (authority);
/* If we don't have an existing program associated with the
* glsl-authority then start generating code for a new shader...
*/
if (shader_state == NULL)
{
/* Check if there is already a similar cached pipeline whose
shader state we can share */
if (G_LIKELY (!(COGL_DEBUG_ENABLED
(COGL_DEBUG_DISABLE_PROGRAM_CACHES))))
{
template_pipeline =
_cogl_pipeline_cache_get_fragment_template (ctx->pipeline_cache,
authority);
shader_state = get_shader_state (template_pipeline);
}
if (shader_state)
shader_state->ref_count++;
else
shader_state = shader_state_new (n_layers);
set_shader_state (authority, shader_state);
if (template_pipeline)
{
shader_state->ref_count++;
set_shader_state (template_pipeline, shader_state);
}
}
/* If the pipeline isn't actually its own glsl-authority
* then take a reference to the program state associated
* with the glsl-authority... */
if (authority != pipeline)
{
shader_state->ref_count++;
set_shader_state (pipeline, shader_state);
}
}
if (shader_state->gl_shader)
{
/* If we already have a valid GLSL shader then we don't need to
generate a new one. However if there's a user program and it
has changed since the last link then we do need a new shader */
if (user_program == NULL ||
shader_state->user_program_age == user_program->age)
return TRUE;
/* We need to recreate the shader so destroy the existing one */
GE( ctx, glDeleteShader (shader_state->gl_shader) );
shader_state->gl_shader = 0;
}
/* If we make it here then we have a glsl_shader_state struct
without a gl_shader either because this is the first time we've
encountered it or because the user program has changed */
if (user_program)
shader_state->user_program_age = user_program->age;
/* If the user program contains a fragment shader then we don't need
to generate one */
if (user_program &&
_cogl_program_has_fragment_shader (user_program))
return TRUE;
/* We reuse two grow-only GStrings for code-gen. One string
contains the uniform and attribute declarations while the
other contains the main function. We need two strings
because we need to dynamically declare attributes as the
add_layer callback is invoked */
g_string_set_size (ctx->codegen_header_buffer, 0);
g_string_set_size (ctx->codegen_source_buffer, 0);
shader_state->header = ctx->codegen_header_buffer;
shader_state->source = ctx->codegen_source_buffer;
COGL_LIST_INIT (&shader_state->layers);
g_string_append (shader_state->source,
"void\n"
"main ()\n"
"{\n");
for (i = 0; i < n_layers; i++)
{
shader_state->unit_state[i].sampled = FALSE;
shader_state->unit_state[i].combine_constant_used = FALSE;
}
return TRUE;
}
static void
add_constant_lookup (CoglPipelineShaderState *shader_state,
CoglPipeline *pipeline,
CoglPipelineLayer *layer,
const char *swizzle)
{
int unit_index = _cogl_pipeline_layer_get_unit_index (layer);
/* Create a sampler uniform for this layer if we haven't already */
if (!shader_state->unit_state[unit_index].combine_constant_used)
{
g_string_append_printf (shader_state->header,
"uniform vec4 _cogl_layer_constant_%i;\n",
unit_index);
shader_state->unit_state[unit_index].combine_constant_used = TRUE;
}
g_string_append_printf (shader_state->source,
"_cogl_layer_constant_%i.%s",
unit_index, swizzle);
}
static void
ensure_texture_lookup_generated (CoglPipelineShaderState *shader_state,
CoglPipeline *pipeline,
CoglPipelineLayer *layer)
{
CoglHandle texture;
int unit_index = _cogl_pipeline_layer_get_unit_index (layer);
const char *target_string, *tex_coord_swizzle;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (shader_state->unit_state[unit_index].sampled)
return;
shader_state->unit_state[unit_index].sampled = TRUE;
g_string_append_printf (shader_state->source,
" vec4 texel%i = ",
unit_index);
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_TEXTURING)))
{
g_string_append (shader_state->source,
"vec4 (1.0, 1.0, 1.0, 1.0);\n");
return;
}
texture = _cogl_pipeline_layer_get_texture (layer);
if (texture == NULL)
{
target_string = "2D";
tex_coord_swizzle = "st";
}
else
{
GLenum gl_target;
cogl_texture_get_gl_texture (texture, NULL, &gl_target);
switch (gl_target)
{
#ifdef HAVE_COGL_GL
case GL_TEXTURE_1D:
target_string = "1D";
tex_coord_swizzle = "s";
break;
#endif
case GL_TEXTURE_2D:
target_string = "2D";
tex_coord_swizzle = "st";
break;
#ifdef GL_ARB_texture_rectangle
case GL_TEXTURE_RECTANGLE_ARB:
target_string = "2DRect";
tex_coord_swizzle = "st";
break;
#endif
case GL_TEXTURE_3D:
target_string = "3D";
tex_coord_swizzle = "stp";
break;
default:
g_assert_not_reached ();
}
}
/* Create a sampler uniform */
g_string_append_printf (shader_state->header,
"uniform sampler%s _cogl_sampler_%i;\n",
target_string,
unit_index);
g_string_append_printf (shader_state->source,
"texture%s (_cogl_sampler_%i, ",
target_string, unit_index);
/* If point sprite coord generation is being used then divert to the
built-in varying var for that instead of the texture
coordinates. We don't want to do this under GL because in that
case we will instead use glTexEnv(GL_COORD_REPLACE) to replace
the texture coords with the point sprite coords. Although GL also
supports the gl_PointCoord variable, it requires GLSL 1.2 which
would mean we would have to declare the GLSL version and check
for it */
if (ctx->driver == COGL_DRIVER_GLES2 &&
cogl_pipeline_get_layer_point_sprite_coords_enabled (pipeline,
layer->index))
g_string_append_printf (shader_state->source,
"gl_PointCoord.%s",
tex_coord_swizzle);
else
g_string_append_printf (shader_state->source,
"cogl_tex_coord_in[%d].%s",
unit_index, tex_coord_swizzle);
g_string_append (shader_state->source, ");\n");
}
static void
add_arg (CoglPipelineShaderState *shader_state,
CoglPipeline *pipeline,
CoglPipelineLayer *layer,
int previous_layer_index,
CoglPipelineCombineSource src,
CoglPipelineCombineOp operand,
const char *swizzle)
{
GString *shader_source = shader_state->source;
char alpha_swizzle[5] = "aaaa";
g_string_append_c (shader_source, '(');
if (operand == COGL_PIPELINE_COMBINE_OP_ONE_MINUS_SRC_COLOR ||
operand == COGL_PIPELINE_COMBINE_OP_ONE_MINUS_SRC_ALPHA)
g_string_append_printf (shader_source,
"vec4(1.0, 1.0, 1.0, 1.0).%s - ",
swizzle);
/* If the operand is reading from the alpha then replace the swizzle
with the same number of copies of the alpha */
if (operand == COGL_PIPELINE_COMBINE_OP_SRC_ALPHA ||
operand == COGL_PIPELINE_COMBINE_OP_ONE_MINUS_SRC_ALPHA)
{
alpha_swizzle[strlen (swizzle)] = '\0';
swizzle = alpha_swizzle;
}
switch (src)
{
case COGL_PIPELINE_COMBINE_SOURCE_TEXTURE:
g_string_append_printf (shader_source,
"texel%i.%s",
_cogl_pipeline_layer_get_unit_index (layer),
swizzle);
break;
case COGL_PIPELINE_COMBINE_SOURCE_CONSTANT:
add_constant_lookup (shader_state,
pipeline,
layer,
swizzle);
break;
case COGL_PIPELINE_COMBINE_SOURCE_PREVIOUS:
if (previous_layer_index >= 0)
{
g_string_append_printf (shader_source,
"layer%i.%s",
previous_layer_index,
swizzle);
break;
}
/* flow through */
case COGL_PIPELINE_COMBINE_SOURCE_PRIMARY_COLOR:
g_string_append_printf (shader_source, "cogl_color_in.%s", swizzle);
break;
default:
if (src >= COGL_PIPELINE_COMBINE_SOURCE_TEXTURE0 &&
src < COGL_PIPELINE_COMBINE_SOURCE_TEXTURE0 + 32)
g_string_append_printf (shader_source,
"texel%i.%s",
src - COGL_PIPELINE_COMBINE_SOURCE_TEXTURE0,
swizzle);
break;
}
g_string_append_c (shader_source, ')');
}
typedef struct
{
int unit_index;
CoglPipelineLayer *layer;
} FindPipelineLayerData;
static gboolean
find_pipeline_layer_cb (CoglPipelineLayer *layer,
void *user_data)
{
FindPipelineLayerData *data = user_data;
int unit_index;
unit_index = _cogl_pipeline_layer_get_unit_index (layer);
if (unit_index == data->unit_index)
{
data->layer = layer;
return FALSE;
}
return TRUE;
}
static void
ensure_arg_generated (CoglPipeline *pipeline,
CoglPipelineLayer *layer,
int previous_layer_index,
CoglPipelineCombineSource src)
{
CoglPipelineShaderState *shader_state = get_shader_state (pipeline);
switch (src)
{
case COGL_PIPELINE_COMBINE_SOURCE_CONSTANT:
case COGL_PIPELINE_COMBINE_SOURCE_PRIMARY_COLOR:
/* These don't involve any other layers */
break;
case COGL_PIPELINE_COMBINE_SOURCE_PREVIOUS:
if (previous_layer_index >= 0)
ensure_layer_generated (pipeline, previous_layer_index);
break;
case COGL_PIPELINE_COMBINE_SOURCE_TEXTURE:
ensure_texture_lookup_generated (shader_state,
pipeline,
layer);
break;
default:
if (src >= COGL_PIPELINE_COMBINE_SOURCE_TEXTURE0 &&
src < COGL_PIPELINE_COMBINE_SOURCE_TEXTURE0 + 32)
{
FindPipelineLayerData data;
data.unit_index = src - COGL_PIPELINE_COMBINE_SOURCE_TEXTURE0;
data.layer = layer;
_cogl_pipeline_foreach_layer_internal (pipeline,
find_pipeline_layer_cb,
&data);
ensure_texture_lookup_generated (shader_state,
pipeline,
data.layer);
}
break;
}
}
static void
append_masked_combine (CoglPipeline *pipeline,
CoglPipelineLayer *layer,
int previous_layer_index,
const char *swizzle,
CoglPipelineCombineFunc function,
CoglPipelineCombineSource *src,
CoglPipelineCombineOp *op)
{
CoglPipelineShaderState *shader_state = get_shader_state (pipeline);
GString *shader_source = shader_state->source;
int n_args;
int i;
n_args = _cogl_get_n_args_for_combine_func (function);
for (i = 0; i < n_args; i++)
ensure_arg_generated (pipeline, layer, previous_layer_index, src[i]);
g_string_append_printf (shader_state->source,
" layer%i.%s = ",
layer->index,
swizzle);
switch (function)
{
case COGL_PIPELINE_COMBINE_FUNC_REPLACE:
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[0], op[0], swizzle);
break;
case COGL_PIPELINE_COMBINE_FUNC_MODULATE:
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[0], op[0], swizzle);
g_string_append (shader_source, " * ");
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[1], op[1], swizzle);
break;
case COGL_PIPELINE_COMBINE_FUNC_ADD:
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[0], op[0], swizzle);
g_string_append (shader_source, " + ");
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[1], op[1], swizzle);
break;
case COGL_PIPELINE_COMBINE_FUNC_ADD_SIGNED:
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[0], op[0], swizzle);
g_string_append (shader_source, " + ");
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[1], op[1], swizzle);
g_string_append_printf (shader_source,
" - vec4(0.5, 0.5, 0.5, 0.5).%s",
swizzle);
break;
case COGL_PIPELINE_COMBINE_FUNC_SUBTRACT:
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[0], op[0], swizzle);
g_string_append (shader_source, " - ");
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[1], op[1], swizzle);
break;
case COGL_PIPELINE_COMBINE_FUNC_INTERPOLATE:
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[0], op[0], swizzle);
g_string_append (shader_source, " * ");
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[2], op[2], swizzle);
g_string_append (shader_source, " + ");
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[1], op[1], swizzle);
g_string_append_printf (shader_source,
" * (vec4(1.0, 1.0, 1.0, 1.0).%s - ",
swizzle);
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[2], op[2], swizzle);
g_string_append_c (shader_source, ')');
break;
case COGL_PIPELINE_COMBINE_FUNC_DOT3_RGB:
case COGL_PIPELINE_COMBINE_FUNC_DOT3_RGBA:
g_string_append (shader_source, "vec4(4.0 * ((");
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[0], op[0], "r");
g_string_append (shader_source, " - 0.5) * (");
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[1], op[1], "r");
g_string_append (shader_source, " - 0.5) + (");
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[0], op[0], "g");
g_string_append (shader_source, " - 0.5) * (");
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[1], op[1], "g");
g_string_append (shader_source, " - 0.5) + (");
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[0], op[0], "b");
g_string_append (shader_source, " - 0.5) * (");
add_arg (shader_state, pipeline, layer, previous_layer_index,
src[1], op[1], "b");
g_string_append_printf (shader_source, " - 0.5))).%s", swizzle);
break;
}
g_string_append_printf (shader_source, ";\n");
}
static void
ensure_layer_generated (CoglPipeline *pipeline,
int layer_index)
{
CoglPipelineShaderState *shader_state = get_shader_state (pipeline);
CoglPipelineLayer *combine_authority;
CoglPipelineLayerBigState *big_state;
CoglPipelineLayer *layer;
LayerData *layer_data;
/* Find the layer that corresponds to this layer_num */
COGL_LIST_FOREACH (layer_data, &shader_state->layers, list_node)
{
layer = layer_data->layer;
if (layer->index == layer_index)
goto found;
}
/* If we didn't find it then we can assume the layer has already
been generated */
return;
found:
/* Remove the layer from the list so we don't generate it again */
COGL_LIST_REMOVE (layer_data, list_node);
combine_authority =
_cogl_pipeline_layer_get_authority (layer,
COGL_PIPELINE_LAYER_STATE_COMBINE);
big_state = combine_authority->big_state;
g_string_append_printf (shader_state->source,
" vec4 layer%i;\n",
layer_index);
if (!_cogl_pipeline_need_texture_combine_separate (combine_authority) ||
/* GL_DOT3_RGBA Is a bit weird as a GL_COMBINE_RGB function
* since if you use it, it overrides your ALPHA function...
*/
big_state->texture_combine_rgb_func ==
COGL_PIPELINE_COMBINE_FUNC_DOT3_RGBA)
append_masked_combine (pipeline,
layer,
layer_data->previous_layer_index,
"rgba",
big_state->texture_combine_rgb_func,
big_state->texture_combine_rgb_src,
big_state->texture_combine_rgb_op);
else
{
append_masked_combine (pipeline,
layer,
layer_data->previous_layer_index,
"rgb",
big_state->texture_combine_rgb_func,
big_state->texture_combine_rgb_src,
big_state->texture_combine_rgb_op);
append_masked_combine (pipeline,
layer,
layer_data->previous_layer_index,
"a",
big_state->texture_combine_alpha_func,
big_state->texture_combine_alpha_src,
big_state->texture_combine_alpha_op);
}
g_slice_free (LayerData, layer_data);
}
static gboolean
_cogl_pipeline_fragend_glsl_add_layer (CoglPipeline *pipeline,
CoglPipelineLayer *layer,
unsigned long layers_difference)
{
CoglPipelineShaderState *shader_state = get_shader_state (pipeline);
LayerData *layer_data;
if (!shader_state->source)
return TRUE;
/* Store the layers in reverse order */
layer_data = g_slice_new (LayerData);
layer_data->layer = layer;
if (COGL_LIST_EMPTY (&shader_state->layers))
layer_data->previous_layer_index = -1;
else
layer_data->previous_layer_index
= COGL_LIST_FIRST (&shader_state->layers)->layer->index;
COGL_LIST_INSERT_HEAD (&shader_state->layers, layer_data, list_node);
return TRUE;
}
/* GLES2 doesn't have alpha testing so we need to implement it in the
shader */
#ifdef HAVE_COGL_GLES2
static void
add_alpha_test_snippet (CoglPipeline *pipeline,
CoglPipelineShaderState *shader_state)
{
CoglPipelineAlphaFunc alpha_func;
alpha_func = cogl_pipeline_get_alpha_test_function (pipeline);
if (alpha_func == COGL_PIPELINE_ALPHA_FUNC_ALWAYS)
/* Do nothing */
return;
if (alpha_func == COGL_PIPELINE_ALPHA_FUNC_NEVER)
{
/* Always discard the fragment */
g_string_append (shader_state->source,
" discard;\n");
return;
}
/* For all of the other alpha functions we need a uniform for the
reference */
g_string_append (shader_state->header,
"uniform float _cogl_alpha_test_ref;\n");
g_string_append (shader_state->source,
" if (cogl_color_out.a ");
switch (alpha_func)
{
case COGL_PIPELINE_ALPHA_FUNC_LESS:
g_string_append (shader_state->source, ">=");
break;
case COGL_PIPELINE_ALPHA_FUNC_EQUAL:
g_string_append (shader_state->source, "!=");
break;
case COGL_PIPELINE_ALPHA_FUNC_LEQUAL:
g_string_append (shader_state->source, ">");
break;
case COGL_PIPELINE_ALPHA_FUNC_GREATER:
g_string_append (shader_state->source, "<=");
break;
case COGL_PIPELINE_ALPHA_FUNC_NOTEQUAL:
g_string_append (shader_state->source, "==");
break;
case COGL_PIPELINE_ALPHA_FUNC_GEQUAL:
g_string_append (shader_state->source, "< ");
break;
case COGL_PIPELINE_ALPHA_FUNC_ALWAYS:
case COGL_PIPELINE_ALPHA_FUNC_NEVER:
g_assert_not_reached ();
break;
}
g_string_append (shader_state->source,
" _cogl_alpha_test_ref)\n discard;\n");
}
#endif /* HAVE_COGL_GLES2 */
gboolean
_cogl_pipeline_fragend_glsl_end (CoglPipeline *pipeline,
unsigned long pipelines_difference)
{
CoglPipelineShaderState *shader_state = get_shader_state (pipeline);
_COGL_GET_CONTEXT (ctx, FALSE);
if (shader_state->source)
{
const char *source_strings[2];
GLint lengths[2];
GLint compile_status;
GLuint shader;
int n_tex_coord_attribs = 0;
int i, n_layers;
COGL_STATIC_COUNTER (fragend_glsl_compile_counter,
"glsl fragment compile counter",
"Increments each time a new GLSL "
"fragment shader is compiled",
0 /* no application private data */);
COGL_COUNTER_INC (_cogl_uprof_context, fragend_glsl_compile_counter);
/* We only need to generate code to calculate the fragment value
for the last layer. If the value of this layer depends on any
previous layers then it will recursively generate the code
for those layers */
if (!COGL_LIST_EMPTY (&shader_state->layers))
{
CoglPipelineLayer *last_layer;
LayerData *layer_data, *tmp;
last_layer = COGL_LIST_FIRST (&shader_state->layers)->layer;
ensure_layer_generated (pipeline, last_layer->index);
g_string_append_printf (shader_state->source,
" cogl_color_out = layer%i;\n",
last_layer->index);
COGL_LIST_FOREACH_SAFE (layer_data, &shader_state->layers,
list_node, tmp)
g_slice_free (LayerData, layer_data);
}
else
g_string_append (shader_state->source,
" cogl_color_out = cogl_color_in;\n");
#ifdef HAVE_COGL_GLES2
if (ctx->driver == COGL_DRIVER_GLES2)
add_alpha_test_snippet (pipeline, shader_state);
#endif
g_string_append (shader_state->source, "}\n");
GE_RET( shader, ctx, glCreateShader (GL_FRAGMENT_SHADER) );
lengths[0] = shader_state->header->len;
source_strings[0] = shader_state->header->str;
lengths[1] = shader_state->source->len;
source_strings[1] = shader_state->source->str;
/* Find the highest texture unit that is sampled to pass as the
number of texture coordinate attributes */
n_layers = cogl_pipeline_get_n_layers (pipeline);
for (i = 0; i < n_layers; i++)
if (shader_state->unit_state[i].sampled)
n_tex_coord_attribs = i + 1;
_cogl_shader_set_source_with_boilerplate (shader, GL_FRAGMENT_SHADER,
n_tex_coord_attribs,
2, /* count */
source_strings, lengths);
GE( ctx, glCompileShader (shader) );
GE( ctx, glGetShaderiv (shader, GL_COMPILE_STATUS, &compile_status) );
if (!compile_status)
{
GLint len = 0;
char *shader_log;
GE( ctx, glGetShaderiv (shader, GL_INFO_LOG_LENGTH, &len) );
shader_log = g_alloca (len);
GE( ctx, glGetShaderInfoLog (shader, len, &len, shader_log) );
g_warning ("Shader compilation failed:\n%s", shader_log);
}
shader_state->header = NULL;
shader_state->source = NULL;
shader_state->gl_shader = shader;
}
return TRUE;
}
static void
_cogl_pipeline_fragend_glsl_pre_change_notify (CoglPipeline *pipeline,
CoglPipelineState change,
const CoglColor *new_color)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if ((change & _cogl_pipeline_get_state_for_fragment_codegen (ctx)))
dirty_shader_state (pipeline);
}
/* NB: layers are considered immutable once they have any dependants
* so although multiple pipelines can end up depending on a single
* static layer, we can guarantee that if a layer is being *changed*
* then it can only have one pipeline depending on it.
*
* XXX: Don't forget this is *pre* change, we can't read the new value
* yet!
*/
static void
_cogl_pipeline_fragend_glsl_layer_pre_change_notify (
CoglPipeline *owner,
CoglPipelineLayer *layer,
CoglPipelineLayerState change)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if ((change & _cogl_pipeline_get_layer_state_for_fragment_codegen (ctx)))
{
dirty_shader_state (owner);
return;
}
/* TODO: we could be saving snippets of texture combine code along
* with each layer and then when a layer changes we would just free
* the snippet. */
}
const CoglPipelineFragend _cogl_pipeline_glsl_fragend =
{
_cogl_pipeline_fragend_glsl_start,
_cogl_pipeline_fragend_glsl_add_layer,
NULL, /* passthrough */
_cogl_pipeline_fragend_glsl_end,
_cogl_pipeline_fragend_glsl_pre_change_notify,
NULL, /* pipeline_set_parent_notify */
_cogl_pipeline_fragend_glsl_layer_pre_change_notify
};
#endif /* COGL_PIPELINE_FRAGEND_GLSL */
Reference in New Issue View Git Blame Copy Permalink