radeon/r200/r300/r600: add check_blit vtbl function

Check if the native blit formats are supported, if not,
attempt to use an alternate format.

Skip 3, >4 bpp as per comments from mcencora on irc.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>

3 files changed, 5 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/r200/r200_blit.c b/src/mesa/drivers/dri/r200/r200_blit.c
index 56b08a21bd..b56327dad5 100644
--- a/src/mesa/drivers/dri/r200/r200_blit.c
+++ b/src/mesa/drivers/dri/r200/r200_blit.c
@@ -38,7 +38,7 @@ static inline uint32_t cmdpacket0(struct radeon_screen *rscrn,
 }
 
 /* common formats supported as both textures and render targets */
-static unsigned is_blit_supported(gl_format mesa_format)
+unsigned r200_check_blit(gl_format mesa_format)
 {
     /* XXX others?  BE/LE? */
     switch (mesa_format) {
@@ -337,7 +337,7 @@ unsigned r200_blit(GLcontext *ctx,
 {
     struct r200_context *r200 = R200_CONTEXT(ctx);
 
-    if (!is_blit_supported(dst_mesaformat))
+    if (!r200_check_blit(dst_mesaformat))
         return GL_FALSE;
 
     /* Make sure that colorbuffer has even width - hw limitation */
diff --git a/src/mesa/drivers/dri/r200/r200_blit.h b/src/mesa/drivers/dri/r200/r200_blit.h
index 38487266ae..53206f0b47 100644
--- a/src/mesa/drivers/dri/r200/r200_blit.h
+++ b/src/mesa/drivers/dri/r200/r200_blit.h
@@ -30,6 +30,8 @@
 
 void r200_blit_init(struct r200_context *r200);
 
+unsigned r200_check_blit(gl_format mesa_format);
+
 unsigned r200_blit(GLcontext *ctx,
                    struct radeon_bo *src_bo,
                    intptr_t src_offset,
diff --git a/src/mesa/drivers/dri/r200/r200_context.c b/src/mesa/drivers/dri/r200/r200_context.c
index 6ecd46ecd9..dad2580e08 100644
--- a/src/mesa/drivers/dri/r200/r200_context.c
+++ b/src/mesa/drivers/dri/r200/r200_context.c
@@ -264,6 +264,7 @@ static void r200_init_vtbl(radeonContextPtr radeon)
    radeon->vtbl.fallback = r200Fallback;
    radeon->vtbl.update_scissor = r200_vtbl_update_scissor;
    radeon->vtbl.emit_query_finish = r200_emit_query_finish;
+   radeon->vtbl.check_blit = r200_check_blit;
    radeon->vtbl.blit = r200_blit;
 }