static void oil_backend_opengl_draw_triangles(OILImage *im, OILMatrix *matrix, OILImage *tex, OILVertex *vertices, unsigned int vertices_length, unsigned int *indices, unsigned int indices_length, OILTriangleFlags flags) {
unsigned int i;
load_matrix(matrix);
bind_framebuffer(im);
bind_colorbuffer(tex);
mark_dirty(im);
/* if we need to, re-generate the tex mipmaps */
if (tex) {
OpenGLPriv *tex_priv = tex->backend_data;
if (tex_priv->dirty_mipmaps) {
/* tex colorbuffer is already bound */
glGenerateMipmap(GL_TEXTURE_2D);
tex_priv->dirty_mipmaps = 0;
}
}
/* set up any drawing flags */
if (!(flags & OIL_DEPTH_TEST)) {
glDisable(GL_DEPTH_TEST);
}
glBegin(GL_TRIANGLES);
for (i = 0; i < indices_length; i += 3) {
OILVertex v0 = vertices[indices[i]];
OILVertex v1 = vertices[indices[i + 1]];
OILVertex v2 = vertices[indices[i + 2]];
glTexCoord2f(v0.s, v0.t);
glColor4f(v0.color.r / 255.0, v0.color.g / 255.0, v0.color.b / 255.0, v0.color.a / 255.0);
glVertex3f(v0.x, v0.y, v0.z);
glTexCoord2f(v1.s, v1.t);
glColor4f(v1.color.r / 255.0, v1.color.g / 255.0, v1.color.b / 255.0, v1.color.a / 255.0);
glVertex3f(v1.x, v1.y, v1.z);
glTexCoord2f(v2.s, v2.t);
glColor4f(v2.color.r / 255.0, v2.color.g / 255.0, v2.color.b / 255.0, v2.color.a / 255.0);
glVertex3f(v2.x, v2.y, v2.z);
}
glEnd();
/* undo our drawing flags */
if (!(flags & OIL_DEPTH_TEST)) {
glEnable(GL_DEPTH_TEST);
}
}
static void oil_backend_opengl_clear(OILImage *im) {
bind_framebuffer(im);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
static void oil_backend_opengl_load(OILImage *im) {
bind_framebuffer(im);
glReadPixels(0, 0, im->width, im->height, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8_REV, im->data);
}
static
auto bind(framebuffer_target tgt, framebuffer_name fbo)
noexcept
{
return bind_framebuffer(tgt, fbo);
}
