src/gallium/drivers/i965/brw_pipe_blend.c

   1
   2    /* _NEW_COLOR */
   3    if (key->logic_op != GL_COPY) {
   4       cc.cc2.logicop_enable = 1;
   5       cc.cc5.logicop_func = intel_translate_logic_op(key->logic_op);
   6    } else if (key->color_blend) {
   7       GLenum eqRGB = key->blend_eq_rgb;
   8       GLenum eqA = key->blend_eq_a;
   9       GLenum srcRGB = key->blend_src_rgb;
  10       GLenum dstRGB = key->blend_dst_rgb;
  11       GLenum srcA = key->blend_src_a;
  12       GLenum dstA = key->blend_dst_a;
  13
  14       if (eqRGB == GL_MIN || eqRGB == GL_MAX) {
  15          srcRGB = dstRGB = GL_ONE;
  16       }
  17
  18       if (eqA == GL_MIN || eqA == GL_MAX) {
  19          srcA = dstA = GL_ONE;
  20       }
  21
  22       cc.cc6.dest_blend_factor = brw_translate_blend_factor(dstRGB);
  23       cc.cc6.src_blend_factor = brw_translate_blend_factor(srcRGB);
  24       cc.cc6.blend_function = brw_translate_blend_equation(eqRGB);
  25
  26       cc.cc5.ia_dest_blend_factor = brw_translate_blend_factor(dstA);
  27       cc.cc5.ia_src_blend_factor = brw_translate_blend_factor(srcA);
  28       cc.cc5.ia_blend_function = brw_translate_blend_equation(eqA);
  29
  30       cc.cc3.blend_enable = 1;
  31       cc.cc3.ia_blend_enable = (srcA != srcRGB ||
  32                                 dstA != dstRGB ||
  33                                 eqA != eqRGB);
  34    }
  35
  36    if (key->dither) {
  37       cc.cc5.dither_enable = 1;
  38       cc.cc6.y_dither_offset = 0;
  39       cc.cc6.x_dither_offset = 0;
  40    }
  41