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glw_opengl_ff.c
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glw_opengl_ff.c
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/*
* libglw, OpenGL interface
* Copyright (C) 2008 Andreas Öman
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include "glw.h"
#include "glw_renderer.h"
#include "fileaccess/fileaccess.h"
const static float projection[16] = {
2.414213,0.000000,0.000000,0.000000,
0.000000,2.414213,0.000000,0.000000,
0.000000,0.000000,1.033898,-1.000000,
0.000000,0.000000,2.033898,0.000000
};
/**
*
*/
static void
hw_set_clip_conf(const struct glw_rctx *rc, int which, const Vec4 v)
{
double plane[4];
plane[0] = glw_vec4_extract(v, 0);
plane[1] = glw_vec4_extract(v, 1);
plane[2] = glw_vec4_extract(v, 2);
plane[3] = glw_vec4_extract(v, 3);
glLoadMatrixf(glw_mtx_get(rc->rc_mtx));
glClipPlane(GL_CLIP_PLANE0 + which, plane);
glEnable(GL_CLIP_PLANE0 + which);
}
/**
*
*/
static void
hw_clr_clip_conf(int which)
{
glDisable(GL_CLIP_PLANE0 + which);
}
static void
ff_render(struct glw_root *gr,
const Mtx m,
const struct glw_backend_texture *t0,
const struct glw_backend_texture *t1,
const struct glw_rgb *rgb_mul,
const struct glw_rgb *rgb_off,
float alpha, float blur,
const float *vertices,
int num_vertices,
const uint16_t *indices,
int num_triangles,
int flags,
glw_program_t *p,
const glw_rctx_t *rc)
{
glw_backend_root_t *gbr = &gr->gr_be;
float r,g,b;
switch(gbr->gbr_blendmode) {
case GLW_BLEND_NORMAL:
r = rgb_mul->r;
g = rgb_mul->g;
b = rgb_mul->b;
break;
case GLW_BLEND_ADDITIVE:
r = rgb_mul->r * alpha;
g = rgb_mul->g * alpha;
b = rgb_mul->b * alpha;
break;
default:
return;
}
glLoadMatrixf(glw_mtx_get(m) ?: glw_identitymtx);
glVertexPointer(3, GL_FLOAT, sizeof(float) * VERTEX_SIZE, vertices);
if(flags & GLW_RENDER_COLOR_ATTRIBUTES) {
int i;
glw_vtmp_resize(gr, num_vertices * 4);
for(i = 0; i < num_vertices; i++) {
gr->gr_vtmp_buffer[i * 4 + 0] = vertices[i * VERTEX_SIZE + 4] * r;
gr->gr_vtmp_buffer[i * 4 + 1] = vertices[i * VERTEX_SIZE + 5] * g;
gr->gr_vtmp_buffer[i * 4 + 2] = vertices[i * VERTEX_SIZE + 6] * b;
gr->gr_vtmp_buffer[i * 4 + 3] = vertices[i * VERTEX_SIZE + 7] * alpha;
}
glEnableClientState(GL_COLOR_ARRAY);
glColorPointer(4, GL_FLOAT, 0, gr->gr_vtmp_buffer);
} else {
glColor4f(r, g, b, alpha);
}
if(rgb_off != NULL) {
glEnable(GL_COLOR_SUM);
glSecondaryColor3f(rgb_off->r, rgb_off->g, rgb_off->b);
}
if(t0 == NULL) {
glBindTexture(gbr->gbr_primary_texture_mode, 0);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
} else {
glBindTexture(gbr->gbr_primary_texture_mode, t0->tex);
glTexCoordPointer(2, GL_FLOAT, sizeof(float) * VERTEX_SIZE,
vertices + 8);
}
if(indices != NULL)
glDrawElements(GL_TRIANGLES, 3 * num_triangles,
GL_UNSIGNED_SHORT, indices);
else
glDrawArrays(GL_TRIANGLES, 0, num_vertices);
if(rgb_off != NULL)
glDisable(GL_COLOR_SUM);
if(flags & GLW_RENDER_COLOR_ATTRIBUTES)
glDisableClientState(GL_COLOR_ARRAY);
if(t0 == NULL)
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
}
/**
*
*/
int
glw_opengl_ff_init(glw_root_t *gr)
{
gr->gr_set_hw_clipper = hw_set_clip_conf;
gr->gr_clr_hw_clipper = hw_clr_clip_conf;
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
gr->gr_render = ff_render;
glMatrixMode(GL_PROJECTION);
glLoadMatrixf(projection);
glMatrixMode(GL_MODELVIEW);
prop_set_string(prop_create(gr->gr_prop, "rendermode"),
"OpenGL fixed function");
return 0;
}