202 lines
6.4 KiB
C
202 lines
6.4 KiB
C
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/*
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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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* Robert Bragg <robert@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.h"
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#include "cogl-internal.h"
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#include "cogl-context.h"
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#include "cogl-handle.h"
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#include "cogl-material-private.h"
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#include "cogl-texture-private.h"
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#include "cogl-blend-string.h"
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#include "cogl-profile.h"
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#ifndef HAVE_COGL_GLES
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#include "cogl-program.h"
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#endif
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#include <glib.h>
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#include <glib/gprintf.h>
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#include <string.h>
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#ifdef HAVE_COGL_GLES2
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#include "../gles/cogl-gles2-wrapper.h"
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#endif
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static int
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_cogl_material_backend_fixed_get_max_texture_units (void)
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{
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_COGL_GET_CONTEXT (ctx, 0);
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/* This function is called quite often so we cache the value to
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avoid too many GL calls */
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if (ctx->max_texture_units == -1)
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{
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ctx->max_texture_units = 1;
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GE (glGetIntegerv (GL_MAX_TEXTURE_UNITS,
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&ctx->max_texture_units));
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}
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return ctx->max_texture_units;
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}
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static gboolean
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_cogl_material_backend_fixed_start (CoglMaterial *material,
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int n_layers,
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unsigned long materials_difference)
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{
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_cogl_use_program (COGL_INVALID_HANDLE, COGL_MATERIAL_PROGRAM_TYPE_FIXED);
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return TRUE;
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}
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static gboolean
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_cogl_material_backend_fixed_add_layer (CoglMaterial *material,
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CoglMaterialLayer *layer,
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unsigned long layers_difference)
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{
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CoglTextureUnit *unit =
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_cogl_get_texture_unit (_cogl_material_layer_get_unit_index (layer));
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int unit_index = unit->index;
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int n_rgb_func_args;
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int n_alpha_func_args;
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_COGL_GET_CONTEXT (ctx, FALSE);
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/* XXX: Beware that since we are changing the active texture unit we
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* must make sure we don't call into other Cogl components that may
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* temporarily bind texture objects to query/modify parameters since
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* they will end up binding texture unit 1. See
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* _cogl_bind_gl_texture_transient for more details.
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*/
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_cogl_set_active_texture_unit (unit_index);
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if (layers_difference & COGL_MATERIAL_LAYER_STATE_COMBINE)
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{
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CoglMaterialLayer *authority =
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_cogl_material_layer_get_authority (layer,
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COGL_MATERIAL_LAYER_STATE_COMBINE);
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CoglMaterialLayerBigState *big_state = authority->big_state;
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE));
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/* Set the combiner functions... */
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GE (glTexEnvi (GL_TEXTURE_ENV,
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GL_COMBINE_RGB,
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big_state->texture_combine_rgb_func));
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GE (glTexEnvi (GL_TEXTURE_ENV,
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GL_COMBINE_ALPHA,
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big_state->texture_combine_alpha_func));
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/*
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* Setup the function arguments...
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*/
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/* For the RGB components... */
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n_rgb_func_args =
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_cogl_get_n_args_for_combine_func (big_state->texture_combine_rgb_func);
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_RGB,
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big_state->texture_combine_rgb_src[0]));
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB,
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big_state->texture_combine_rgb_op[0]));
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if (n_rgb_func_args > 1)
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{
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC1_RGB,
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big_state->texture_combine_rgb_src[1]));
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_RGB,
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big_state->texture_combine_rgb_op[1]));
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}
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if (n_rgb_func_args > 2)
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{
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC2_RGB,
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big_state->texture_combine_rgb_src[2]));
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND2_RGB,
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big_state->texture_combine_rgb_op[2]));
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}
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/* For the Alpha component */
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n_alpha_func_args =
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_cogl_get_n_args_for_combine_func (big_state->texture_combine_alpha_func);
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_ALPHA,
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big_state->texture_combine_alpha_src[0]));
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_ALPHA,
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big_state->texture_combine_alpha_op[0]));
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if (n_alpha_func_args > 1)
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{
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC1_ALPHA,
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big_state->texture_combine_alpha_src[1]));
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_ALPHA,
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big_state->texture_combine_alpha_op[1]));
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}
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if (n_alpha_func_args > 2)
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{
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC2_ALPHA,
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big_state->texture_combine_alpha_src[2]));
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GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND2_ALPHA,
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big_state->texture_combine_alpha_op[2]));
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}
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}
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if (layers_difference & COGL_MATERIAL_LAYER_STATE_COMBINE)
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{
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CoglMaterialLayer *authority =
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_cogl_material_layer_get_authority (layer,
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COGL_MATERIAL_LAYER_STATE_COMBINE);
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CoglMaterialLayerBigState *big_state = authority->big_state;
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GE (glTexEnvfv (GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR,
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big_state->texture_combine_constant));
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}
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return TRUE;
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}
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static gboolean
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_cogl_material_backend_fixed_end (CoglMaterial *material,
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unsigned long materials_difference)
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{
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return TRUE;
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}
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const CoglMaterialBackend _cogl_material_fixed_backend =
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{
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_cogl_material_backend_fixed_get_max_texture_units,
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_cogl_material_backend_fixed_start,
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_cogl_material_backend_fixed_add_layer,
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NULL, /* passthrough */
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_cogl_material_backend_fixed_end,
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NULL, /* material_change_notify */
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NULL, /* material_set_parent_notify */
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NULL, /* layer_change_notify */
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NULL /* free_priv */
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};
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