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glsl: always emit sampler uniforms for non NULL layers

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There might be custom hooks that want to sample arbitrary layers
even though they aren't referenced as part of the auto generated layer
combine code. This ensures the sampler uniforms are always output for
non-null layers so at least these can be used.

We may consider changing this later to always emit a wrapper
cogl_sampleX() function for each layer so all samples of a layer can
consistently be modified by a COGL_SNIPPET_HOOK_TEXTURE_LOOKUP hook.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
This commit is contained in:
Robert Bragg 2012-01-03 11:42:42 +00:00 committed by Neil Roberts
parent aa9c293502
commit 2caf9e0f59
2 changed files with 61 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

92
cogl/cogl-pipeline-fragend-glsl.c
View File

@ -372,6 +372,44 @@ add_constant_lookup (CoglPipelineShaderState *shader_state,
layer->index, swizzle);
}
static void
get_texture_target_string (CoglTextureType texture_type,
const char **target_string_out,
const char **swizzle_out)
{
const char *target_string, *tex_coord_swizzle;
switch (texture_type)
{
#if 0 /* TODO */
case COGL_TEXTURE_TYPE_1D:
target_string = "1D";
tex_coord_swizzle = "s";
break;
#endif
case COGL_TEXTURE_TYPE_2D:
target_string = "2D";
tex_coord_swizzle = "st";
break;
case COGL_TEXTURE_TYPE_3D:
target_string = "3D";
tex_coord_swizzle = "stp";
break;
case COGL_TEXTURE_TYPE_RECTANGLE:
target_string = "2DRect";
tex_coord_swizzle = "st";
break;
}
if (target_string_out)
*target_string_out = target_string;
if (swizzle_out)
*swizzle_out = tex_coord_swizzle;
}
static void
ensure_texture_lookup_generated (CoglPipelineShaderState *shader_state,
CoglPipeline *pipeline,
@ -424,37 +462,9 @@ ensure_texture_lookup_generated (CoglPipelineShaderState *shader_state,
_cogl_pipeline_layer_get_texture_type (layer);
const char *target_string, *tex_coord_swizzle;
switch (texture_type)
{
#if 0 /* TODO */
case COGL_TEXTURE_TYPE_1D:
target_string = "1D";
tex_coord_swizzle = "s";
break;
#endif
case COGL_TEXTURE_TYPE_2D:
target_string = "2D";
tex_coord_swizzle = "st";
break;
case COGL_TEXTURE_TYPE_3D:
target_string = "3D";
tex_coord_swizzle = "stp";
break;
case COGL_TEXTURE_TYPE_RECTANGLE:
target_string = "2DRect";
tex_coord_swizzle = "st";
break;
}
/* Create a sampler uniform */
if (G_LIKELY (!COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_TEXTURING)))
g_string_append_printf (shader_state->header,
"uniform sampler%s _cogl_sampler_%i;\n",
target_string,
layer->index);
get_texture_target_string (texture_type,
&target_string,
&tex_coord_swizzle);
g_string_append_printf (shader_state->header,
"vec4\n"
@ -468,7 +478,7 @@ ensure_texture_lookup_generated (CoglPipelineShaderState *shader_state,
"vec4 (1.0, 1.0, 1.0, 1.0);\n");
else
g_string_append_printf (shader_state->header,
"texture%s (_cogl_sampler_%i, coords.%s);\n",
"texture%s (cogl_sampler%i, coords.%s);\n",
target_string, layer->index, tex_coord_swizzle);
g_string_append (shader_state->header, "}\n");
@ -1014,6 +1024,24 @@ _cogl_pipeline_fragend_glsl_end (CoglPipeline *pipeline,
CoglPipelineLayer *last_layer;
LayerData *layer_data, *tmp;
/* We always emit sampler uniforms in case there will be custom
* layer snippets that want to sample arbitrary layers. */
COGL_LIST_FOREACH (layer_data, &shader_state->layers, list_node)
{
CoglPipelineLayer *layer = layer_data->layer;
CoglTextureType texture_type =
_cogl_pipeline_layer_get_texture_type (layer);
const char *target_string;
get_texture_target_string (texture_type, &target_string, NULL);
g_string_append_printf (shader_state->header,
"uniform sampler%s cogl_sampler%i;\n",
target_string,
layer->index);
}
last_layer = COGL_LIST_FIRST (&shader_state->layers)->layer;
ensure_layer_generated (pipeline, last_layer->index);

2
cogl/cogl-pipeline-progend-glsl.c
View File

@ -371,7 +371,7 @@ get_uniform_cb (CoglPipeline *pipeline,
the program has now been linked */
g_string_set_size (ctx->codegen_source_buffer, 0);
g_string_append_printf (ctx->codegen_source_buffer,
"_cogl_sampler_%i", layer_index);
"cogl_sampler%i", layer_index);
GE_RET( uniform_location,
ctx, glGetUniformLocation (state->gl_program,