[Mesa-dev] [PATCH 12/71] gallium: Add blending to pipe blit

[Axel Davy]

From: Christoph Bumiller <e0425955 at student.tuwien.ac.at>

This type of blending is used for gallium nine software cursor

Signed-off-by: David Heidelberg <david at ixit.cz>
---
 src/gallium/include/pipe/p_state.h           | 1 +
 src/gallium/state_trackers/nine/device9.c    | 1 +
 src/gallium/state_trackers/nine/swapchain9.c | 2 ++
 src/mesa/state_tracker/st_cb_blit.c          | 1 +
 4 files changed, 5 insertions(+)

diff --git a/src/gallium/include/pipe/p_state.h b/src/gallium/include/pipe/p_state.h
index a233610..6dce0aa 100644
--- a/src/gallium/include/pipe/p_state.h
+++ b/src/gallium/include/pipe/p_state.h
@@ -660,6 +660,7 @@ struct pipe_blit_info
 
    boolean render_condition_enable; /**< whether the blit should honor the
                                     current render condition */
+   boolean alpha_blend; /* dst.rgb = src.rgb * src.a + dst.rgb * (1 - src.a) */
 };
 
 
diff --git a/src/gallium/state_trackers/nine/device9.c b/src/gallium/state_trackers/nine/device9.c
index 38af8e3..a1c05b4 100644
--- a/src/gallium/state_trackers/nine/device9.c
+++ b/src/gallium/state_trackers/nine/device9.c
@@ -1460,6 +1460,7 @@ NineDevice9_StretchRect( struct NineDevice9 *This,
     blit.filter = Filter == D3DTEXF_LINEAR ?
        PIPE_TEX_FILTER_LINEAR : PIPE_TEX_FILTER_NEAREST;
     blit.scissor_enable = FALSE;
+    blit.alpha_blend = FALSE;
 
     /* If both of a src and dst dimension are negative, flip them. */
     if (blit.dst.box.width < 0 && blit.src.box.width < 0) {
diff --git a/src/gallium/state_trackers/nine/swapchain9.c b/src/gallium/state_trackers/nine/swapchain9.c
index eb84d08..b8ad403 100644
--- a/src/gallium/state_trackers/nine/swapchain9.c
+++ b/src/gallium/state_trackers/nine/swapchain9.c
@@ -588,6 +588,7 @@ handle_draw_cursor_and_hud( struct NineSwapChain9 *This, struct pipe_resource *r
             blit.src.box.width, blit.src.box.height,
             blit.dst.box.x, blit.dst.box.y);
 
+        blit.alpha_blend = TRUE;
         This->pipe->blit(This->pipe, &blit);
     }
 
@@ -705,6 +706,7 @@ present( struct NineSwapChain9 *This,
         blit.mask = PIPE_MASK_RGBA;
         blit.filter = PIPE_TEX_FILTER_NEAREST;
         blit.scissor_enable = FALSE;
+        blit.alpha_blend = FALSE;
 
         This->pipe->blit(This->pipe, &blit);
     }
diff --git a/src/mesa/state_tracker/st_cb_blit.c b/src/mesa/state_tracker/st_cb_blit.c
index 1396906..4fdef7f 100644
--- a/src/mesa/state_tracker/st_cb_blit.c
+++ b/src/mesa/state_tracker/st_cb_blit.c
@@ -192,6 +192,7 @@ st_BlitFramebuffer(struct gl_context *ctx,
 
    blit.filter = pFilter;
    blit.render_condition_enable = TRUE;
+   blit.alpha_blend = FALSE;
 
    if (mask & GL_COLOR_BUFFER_BIT) {
       struct gl_renderbuffer_attachment *srcAtt =
-- 
2.1.0