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2933423ca7
Previously on GLES2 where there is no builtin point size uniform then we would always add a line to the vertex shader to write to the builtin point size output because when generating the shader it is not possible to determine if the pipeline will be used to draw points or not. This patch changes it so that the default point size is 0.0f which is documented to have undefined results when drawing points. That way we can avoid adding the point size code to the shader in that case. The assumption is that any application that is drawing points will probably have explicitly set the point size on the pipeline anyway so it is not a big deal to change the default size from 1.0f. This adds a new pipeline state flag to track whether the point size is non-zero. This needs to be its own state because altering it needs to cause a different shader to be added to the pipeline cache. The state flags that affect the vertex shader have been changed from a constant to a runtime function because they will be different depending on whether there is a builtin point size uniform. There is also a unit test to ensure that changing the point size does or doesn't generate a new shader depending on the values. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit b2eba06e16b587acbf5c57944a70ceccecb4f175) Conflicts: cogl/cogl-pipeline-private.h cogl/cogl-pipeline-state-private.h cogl/cogl-pipeline-state.c cogl/cogl-pipeline.c
116 lines
3.6 KiB
C
116 lines
3.6 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2008,2009,2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*
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*
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* Authors:
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* Neil Roberts <neil@linux.intel.com>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "cogl-context-private.h"
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#include "cogl-util-gl-private.h"
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#include "cogl-pipeline-private.h"
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#include "cogl-pipeline-state-private.h"
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#include "cogl-pipeline-opengl-private.h"
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#include "cogl-framebuffer-private.h"
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#ifdef COGL_PIPELINE_VERTEND_FIXED
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#include "cogl-context-private.h"
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#include "cogl-object-private.h"
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#include "cogl-program-private.h"
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const CoglPipelineVertend _cogl_pipeline_fixed_vertend;
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static void
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_cogl_pipeline_vertend_fixed_start (CoglPipeline *pipeline,
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int n_layers,
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unsigned long pipelines_difference)
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{
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_cogl_use_vertex_program (0, COGL_PIPELINE_PROGRAM_TYPE_FIXED);
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}
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static CoglBool
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_cogl_pipeline_vertend_fixed_add_layer (CoglPipeline *pipeline,
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CoglPipelineLayer *layer,
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unsigned long layers_difference,
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CoglFramebuffer *framebuffer)
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{
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CoglContext *ctx = framebuffer->context;
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int unit_index = _cogl_pipeline_layer_get_unit_index (layer);
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CoglTextureUnit *unit = _cogl_get_texture_unit (unit_index);
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if (layers_difference & COGL_PIPELINE_LAYER_STATE_USER_MATRIX)
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{
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CoglPipelineLayerState state = COGL_PIPELINE_LAYER_STATE_USER_MATRIX;
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CoglPipelineLayer *authority =
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_cogl_pipeline_layer_get_authority (layer, state);
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CoglMatrixEntry *matrix_entry;
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cogl_matrix_stack_set (unit->matrix_stack,
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&authority->big_state->matrix);
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_cogl_set_active_texture_unit (unit_index);
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matrix_entry = unit->matrix_stack->last_entry;
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_cogl_matrix_entry_flush_to_gl_builtins (ctx, matrix_entry,
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COGL_MATRIX_TEXTURE,
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framebuffer,
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FALSE /* enable flip */);
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}
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return TRUE;
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}
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static CoglBool
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_cogl_pipeline_vertend_fixed_end (CoglPipeline *pipeline,
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unsigned long pipelines_difference)
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{
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_COGL_GET_CONTEXT (ctx, FALSE);
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if (pipelines_difference & COGL_PIPELINE_STATE_POINT_SIZE)
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{
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CoglPipeline *authority =
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_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_POINT_SIZE);
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if (authority->big_state->point_size > 0.0f)
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GE( ctx, glPointSize (authority->big_state->point_size) );
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}
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return TRUE;
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}
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const CoglPipelineVertend _cogl_pipeline_fixed_vertend =
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{
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_cogl_pipeline_vertend_fixed_start,
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_cogl_pipeline_vertend_fixed_add_layer,
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_cogl_pipeline_vertend_fixed_end,
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NULL, /* pipeline_change_notify */
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NULL /* layer_change_notify */
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};
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#endif /* COGL_PIPELINE_VERTEND_FIXED */
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