mesa: per-buffer blend enabled flags

ctx->Color.BlendEnabled is now a GLbitfield instead of a GLboolean to
indicate blend on/off status for each color/draw buffer.

This is infrastructure for GL_EXT_draw_buffers2 and OpenGL 3.x

New functions include _mesa_EnableIndexed(), _mesa_DisableIndexed(), and
_mesa_IsEnabledIndexed().  The enable function corresponds to
glEnableIndexedEXT() for GL_EXT_draw_buffers2 or glEnablei() for GL3.

Note that there's quite a few tests for ctx->Color.BlendEnabled != 0 in
drivers, etc.  Those tests can remain as-is since the mask will be 0 or ~0
unless GL_EXT_draw_buffers2 is enabled.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/mesa/main/blend.c b/src/mesa/main/blend.c
index 830e3b2e51..5a9d94e12d 100644
--- a/src/mesa/main/blend.c
+++ b/src/mesa/main/blend.c
@@ -564,7 +564,7 @@ void _mesa_init_color( GLcontext * ctx )
    ctx->Color.AlphaEnabled = GL_FALSE;
    ctx->Color.AlphaFunc = GL_ALWAYS;
    ctx->Color.AlphaRef = 0;
-   ctx->Color.BlendEnabled = GL_FALSE;
+   ctx->Color.BlendEnabled = 0x0;
    ctx->Color.BlendSrcRGB = GL_ONE;
    ctx->Color.BlendDstRGB = GL_ZERO;
    ctx->Color.BlendSrcA = GL_ONE;