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cogl-pipeline-fragend-glsl: Cache the results of texture lookups

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Whenever a texture lookup is performed for a layer the result is now
stored in a variable and used repeatedly instead of generating the
code for the lookup every time it is accessed. This means for example
when using the INTERPOLATE function with a texture lookup for the
third parameter it will only generate one texture lookup instead of
two.

https://bugzilla.gnome.org/show_bug.cgi?id=656426

Reviewed-by: Robert Bragg <robert@linux.intel.com>
This commit is contained in:
Neil Roberts 2011-08-12 16:29:30 +01:00 committed by Robert Bragg
parent 769c8472dd
commit e7f374d799
1 changed files with 90 additions and 72 deletions
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162
cogl/cogl-pipeline-fragend-glsl.c
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@ -337,10 +337,9 @@ add_constant_lookup (CoglPipelineShaderState *shader_state,
}
static void
add_texture_lookup (CoglPipelineShaderState *shader_state,
CoglPipeline *pipeline,
CoglPipelineLayer *layer,
const char *swizzle)
ensure_texture_lookup_generated (CoglPipelineShaderState *shader_state,
CoglPipeline *pipeline,
CoglPipelineLayer *layer)
{
CoglHandle texture;
int unit_index = _cogl_pipeline_layer_get_unit_index (layer);
@ -348,11 +347,19 @@ add_texture_lookup (CoglPipelineShaderState *shader_state,
_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).");
g_string_append (shader_state->source, swizzle);
"vec4 (1.0, 1.0, 1.0, 1.0);\n");
return;
}
@ -400,15 +407,11 @@ add_texture_lookup (CoglPipelineShaderState *shader_state,
}
}
/* Create a sampler uniform for this layer if we haven't already */
if (!shader_state->unit_state[unit_index].sampled)
{
g_string_append_printf (shader_state->header,
"uniform sampler%s _cogl_sampler_%i;\n",
target_string,
unit_index);
shader_state->unit_state[unit_index].sampled = TRUE;
}
/* 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, ",
@ -433,31 +436,7 @@ add_texture_lookup (CoglPipelineShaderState *shader_state,
"cogl_tex_coord_in[%d].%s",
unit_index, tex_coord_swizzle);
g_string_append_printf (shader_state->source, ").%s", swizzle);
}
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;
g_string_append (shader_state->source, ");\n");
}
static void
@ -492,10 +471,10 @@ add_arg (CoglPipelineShaderState *shader_state,
switch (src)
{
case COGL_PIPELINE_COMBINE_SOURCE_TEXTURE:
add_texture_lookup (shader_state,
pipeline,
layer,
swizzle);
g_string_append_printf (shader_source,
"texel%i.%s",
_cogl_pipeline_layer_get_unit_index (layer),
swizzle);
break;
case COGL_PIPELINE_COMBINE_SOURCE_CONSTANT:
@ -519,6 +498,70 @@ add_arg (CoglPipelineShaderState *shader_state,
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)
@ -532,37 +575,12 @@ add_arg (CoglPipelineShaderState *shader_state,
find_pipeline_layer_cb,
&data);
add_texture_lookup (shader_state,
pipeline,
data.layer,
swizzle);
ensure_texture_lookup_generated (shader_state,
pipeline,
data.layer);
}
break;
}
g_string_append_c (shader_source, ')');
}
static void
ensure_arg_generated (CoglPipeline *pipeline,
CoglPipelineLayer *layer,
int previous_layer_index,
CoglPipelineCombineSource src)
{
switch (src)
{
case COGL_PIPELINE_COMBINE_SOURCE_TEXTURE:
case COGL_PIPELINE_COMBINE_SOURCE_CONSTANT:
case COGL_PIPELINE_COMBINE_SOURCE_PRIMARY_COLOR:
default:
/* 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;
}
}
static void