-unsigned get_gl_blend_equation(BlendEquation eq)
-{
- switch(eq)
- {
- case ADD: return GL_FUNC_ADD;
- case SUBTRACT: return GL_FUNC_SUBTRACT;
- case REVERSE_SUBTRACT: return GL_FUNC_REVERSE_SUBTRACT;
- case MIN: return GL_MIN;
- case MAX: return GL_MAX;
- default: throw invalid_argument("get_gl_blend_equation");
- }
-}
-
-unsigned get_gl_blend_factor(BlendFactor factor)
-{
- switch(factor)
- {
- case ZERO: return GL_ZERO;
- case ONE: return GL_ONE;
- case SRC_COLOR: return GL_SRC_COLOR;
- case ONE_MINUS_SRC_COLOR: return GL_ONE_MINUS_SRC_COLOR;
- case SRC_ALPHA: return GL_SRC_ALPHA;
- case ONE_MINUS_SRC_ALPHA: return GL_ONE_MINUS_SRC_ALPHA;
- case DST_COLOR: return GL_DST_COLOR;
- case ONE_MINUS_DST_COLOR: return GL_ONE_MINUS_DST_COLOR;
- case DST_ALPHA: return GL_DST_ALPHA;
- case ONE_MINUS_DST_ALPHA: return GL_ONE_MINUS_DST_ALPHA;
- case CONSTANT_COLOR: return GL_CONSTANT_COLOR;
- case ONE_MINUS_CONSTANT_COLOR: return GL_ONE_MINUS_CONSTANT_COLOR;
- case CONSTANT_ALPHA: return GL_CONSTANT_ALPHA;
- case ONE_MINUS_CONSTANT_ALPHA: return GL_ONE_MINUS_CONSTANT_ALPHA;
- default: throw invalid_argument("get_gl_blend_factor");
- }
-}
-