cogl/cogl-pipeline-vertend-fixed.c

   1 /*
   2  * Cogl
   3  *
   4  * An object oriented GL/GLES Abstraction/Utility Layer
   5  *
   6  * Copyright (C) 2008,2009,2010 Intel Corporation.
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library. If not, see
  20  * <http://www.gnu.org/licenses/>.
  21  *
  22  *
  23  *
  24  * Authors:
  25  *   Neil Roberts <neil@linux.intel.com>
  26  */
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include "cogl-context-private.h"
  33 #include "cogl-pipeline-private.h"
  34 #include "cogl-pipeline-state-private.h"
  35 #include "cogl-pipeline-opengl-private.h"
  36
  37 #ifdef COGL_PIPELINE_VERTEND_FIXED
  38
  39 #include "cogl-internal.h"
  40 #include "cogl-context-private.h"
  41 #include "cogl-handle.h"
  42 #include "cogl-program-private.h"
  43
  44 const CoglPipelineVertend _cogl_pipeline_fixed_vertend;
  45
  46 static gboolean
  47 _cogl_pipeline_vertend_fixed_start (CoglPipeline *pipeline,
  48                                     int n_layers,
  49                                     unsigned long pipelines_difference,
  50                                     int n_tex_coord_attribs)
  51 {
  52   CoglProgram *user_program;
  53
  54   _COGL_GET_CONTEXT (ctx, FALSE);
  55
  56   if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_FIXED)))
  57     return FALSE;
  58
  59   if (ctx->driver == COGL_DRIVER_GLES2)
  60     return FALSE;
  61
  62   /* Vertex snippets are only supported in the GLSL fragend */
  63   if (_cogl_pipeline_has_vertex_snippets (pipeline))
  64     return FALSE;
  65
  66   /* If there is a user program with a vertex shader then the
  67      appropriate backend for that language should handle it. We can
  68      still use the fixed vertex backend if the program only contains
  69      a fragment shader */
  70   user_program = cogl_pipeline_get_user_program (pipeline);
  71   if (user_program != COGL_INVALID_HANDLE &&
  72       _cogl_program_has_vertex_shader (user_program))
  73     return FALSE;
  74
  75   _cogl_use_vertex_program (0, COGL_PIPELINE_PROGRAM_TYPE_FIXED);
  76
  77   return TRUE;
  78 }
  79
  80 static gboolean
  81 _cogl_pipeline_vertend_fixed_add_layer (CoglPipeline *pipeline,
  82                                         CoglPipelineLayer *layer,
  83                                         unsigned long layers_difference)
  84 {
  85   int unit_index = _cogl_pipeline_layer_get_unit_index (layer);
  86   CoglTextureUnit *unit = _cogl_get_texture_unit (unit_index);
  87
  88   _COGL_GET_CONTEXT (ctx, FALSE);
  89
  90   if (layers_difference & COGL_PIPELINE_LAYER_STATE_USER_MATRIX)
  91     {
  92       CoglPipelineLayerState state = COGL_PIPELINE_LAYER_STATE_USER_MATRIX;
  93       CoglPipelineLayer *authority =
  94         _cogl_pipeline_layer_get_authority (layer, state);
  95
  96       _cogl_matrix_stack_set (unit->matrix_stack,
  97                               &authority->big_state->matrix);
  98
  99       _cogl_set_active_texture_unit (unit_index);
 100
 101       _cogl_matrix_stack_flush_to_gl_builtins (ctx, unit->matrix_stack,
 102                                                COGL_MATRIX_TEXTURE,
 103                                                FALSE /* enable flip */);
 104     }
 105
 106   return TRUE;
 107 }
 108
 109 static gboolean
 110 _cogl_pipeline_vertend_fixed_end (CoglPipeline *pipeline,
 111                                   unsigned long pipelines_difference)
 112 {
 113   _COGL_GET_CONTEXT (ctx, FALSE);
 114
 115   if (pipelines_difference & COGL_PIPELINE_STATE_POINT_SIZE)
 116     {
 117       CoglPipeline *authority =
 118         _cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_POINT_SIZE);
 119
 120       GE( ctx, glPointSize (authority->big_state->point_size) );
 121     }
 122
 123   return TRUE;
 124 }
 125
 126 const CoglPipelineVertend _cogl_pipeline_fixed_vertend =
 127 {
 128   _cogl_pipeline_vertend_fixed_start,
 129   _cogl_pipeline_vertend_fixed_add_layer,
 130   _cogl_pipeline_vertend_fixed_end,
 131   NULL, /* pipeline_change_notify */
 132   NULL /* layer_change_notify */
 133 };
 134
 135 #endif /* COGL_PIPELINE_VERTEND_FIXED */
 136