diff options
-rw-r--r-- | src/mesa/drivers/dri/i965/brw_cc.c | 34 | ||||
-rw-r--r-- | src/mesa/drivers/dri/i965/brw_wm_surface_state.c | 17 |
2 files changed, 48 insertions, 3 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_cc.c b/src/mesa/drivers/dri/i965/brw_cc.c index d4ccd28c9e..ab301b9a3a 100644 --- a/src/mesa/drivers/dri/i965/brw_cc.c +++ b/src/mesa/drivers/dri/i965/brw_cc.c @@ -34,6 +34,7 @@ #include "brw_state.h" #include "brw_defines.h" #include "brw_util.h" +#include "intel_fbo.h" #include "main/macros.h" #include "main/enums.h" @@ -89,6 +90,28 @@ struct brw_cc_unit_key { GLenum depth_func; }; +/** + * Modify blend function to force destination alpha to 1.0 + * + * If \c function specifies a blend function that uses destination alpha, + * replace it with a function that hard-wires destination alpha to 1.0. This + * is used when rendering to xRGB targets. + */ +static GLenum +fix_xRGB_alpha(GLenum function) +{ + switch (function) { + case GL_DST_ALPHA: + return GL_ONE; + + case GL_ONE_MINUS_DST_ALPHA: + case GL_SRC_ALPHA_SATURATE: + return GL_ZERO; + } + + return function; +} + static void cc_unit_populate_key(struct brw_context *brw, struct brw_cc_unit_key *key) { @@ -132,6 +155,17 @@ cc_unit_populate_key(struct brw_context *brw, struct brw_cc_unit_key *key) key->blend_dst_rgb = ctx->Color.BlendDstRGB; key->blend_src_a = ctx->Color.BlendSrcA; key->blend_dst_a = ctx->Color.BlendDstA; + + /* If the renderbuffer is XRGB, we have to frob the blend function to + * force the destination alpha to 1.0. This means replacing GL_DST_ALPHA + * with GL_ONE and GL_ONE_MINUS_DST_ALPAH with GL_ZERO. + */ + if (ctx->Visual.alphaBits == 0) { + key->blend_src_rgb = fix_xRGB_alpha(key->blend_src_rgb); + key->blend_src_a = fix_xRGB_alpha(key->blend_src_a); + key->blend_dst_rgb = fix_xRGB_alpha(key->blend_dst_rgb); + key->blend_dst_a = fix_xRGB_alpha(key->blend_dst_a); + } } key->alpha_enabled = ctx->Color.AlphaEnabled; diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c index b7b6eaec2b..74cf66f9f8 100644 --- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c +++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c @@ -538,11 +538,15 @@ brw_update_renderbuffer_surface(struct brw_context *brw, key.surface_type = BRW_SURFACE_2D; switch (irb->Base.Format) { + /* XRGB and ARGB are treated the same here because the chips in this + * family cannot render to XRGB targets. This means that we have to + * mask writes to alpha (ala glColorMask) and reconfigure the alpha + * blending hardware to use GL_ONE (or GL_ZERO) for cases where + * GL_DST_ALPHA (or GL_ONE_MINUS_DST_ALPHA) is used. + */ case MESA_FORMAT_ARGB8888: - key.surface_format = BRW_SURFACEFORMAT_B8G8R8A8_UNORM; - break; case MESA_FORMAT_XRGB8888: - key.surface_format = BRW_SURFACEFORMAT_B8G8R8X8_UNORM; + key.surface_format = BRW_SURFACEFORMAT_B8G8R8A8_UNORM; break; case MESA_FORMAT_RGB565: key.surface_format = BRW_SURFACEFORMAT_B5G6R5_UNORM; @@ -579,6 +583,13 @@ brw_update_renderbuffer_surface(struct brw_context *brw, /* _NEW_COLOR */ memcpy(key.color_mask, ctx->Color.ColorMask, sizeof(key.color_mask)); + + /* As mentioned above, disable writes to the alpha component when the + * renderbuffer is XRGB. + */ + if (ctx->Visual.alphaBits == 0) + key.color_mask[3] = GL_FALSE; + key.color_blend = (!ctx->Color._LogicOpEnabled && ctx->Color.BlendEnabled); |