[Mesa-dev] [PATCH 1/3] mesa: Implement ext_framebuffer_multisample_blit_scaled extension

[Anuj Phogat]

Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
---
 src/mesa/main/extensions.c |  1 +
 src/mesa/main/fbobject.c   | 17 ++++++++++++++---
 src/mesa/main/mtypes.h     |  1 +
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index d8c5f53..15c9026 100644
--- a/src/mesa/main/extensions.c
+++ b/src/mesa/main/extensions.c
@@ -183,6 +183,7 @@ static const struct extension extension_table[] = {
    { "GL_EXT_fog_coord",                           o(EXT_fog_coord),                           GLL,            1999 },
    { "GL_EXT_framebuffer_blit",                    o(EXT_framebuffer_blit),                    GL,             2005 },
    { "GL_EXT_framebuffer_multisample",             o(EXT_framebuffer_multisample),             GL,             2005 },
+   { "GL_EXT_framebuffer_multisample_blit_scaled", o(EXT_framebuffer_multisample_blit_scaled), GL,             2011 },
    { "GL_EXT_framebuffer_object",                  o(EXT_framebuffer_object),                  GL,             2000 },
    { "GL_EXT_framebuffer_sRGB",                    o(EXT_framebuffer_sRGB),                    GL,             1998 },
    { "GL_EXT_gpu_program_parameters",              o(EXT_gpu_program_parameters),              GLL,            2006 },
diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index 645a8a3..f5696b1 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -2940,8 +2940,18 @@ _mesa_BlitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
       return;
    }
 
-   if (filter != GL_NEAREST && filter != GL_LINEAR) {
-      _mesa_error(ctx, GL_INVALID_ENUM, "glBlitFramebufferEXT(filter)");
+   if (filter != GL_NEAREST && filter != GL_LINEAR &&
+       ((filter != GL_SCALED_RESOLVE_FASTEST_EXT &&
+         filter != GL_SCALED_RESOLVE_NICEST_EXT) ||
+        !ctx->Extensions.EXT_framebuffer_multisample_blit_scaled)) {
+         _mesa_error(ctx, GL_INVALID_ENUM, "glBlitFramebufferEXT(filter)");
+         return;
+   }
+
+   if ((filter == GL_SCALED_RESOLVE_FASTEST_EXT ||
+        filter == GL_SCALED_RESOLVE_NICEST_EXT) &&
+        (readFb->Visual.samples == 0 || drawFb->Visual.samples > 0)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebufferEXT(filter)");
       return;
    }
 
@@ -3174,7 +3184,8 @@ _mesa_BlitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
       }
 
       /* extra checks for multisample copies... */
-      if (readFb->Visual.samples > 0 || drawFb->Visual.samples > 0) {
+      if ((readFb->Visual.samples > 0 || drawFb->Visual.samples > 0) &&
+          (filter == GL_NEAREST || filter == GL_LINEAR)) {
          /* src and dest region sizes must be the same */
          if (abs(srcX1 - srcX0) != abs(dstX1 - dstX0) ||
              abs(srcY1 - srcY0) != abs(dstY1 - dstY0)) {
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 139c6af..9ec0c7d 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -3020,6 +3020,7 @@ struct gl_extensions
    GLboolean EXT_fog_coord;
    GLboolean EXT_framebuffer_blit;
    GLboolean EXT_framebuffer_multisample;
+   GLboolean EXT_framebuffer_multisample_blit_scaled;
    GLboolean EXT_framebuffer_object;
    GLboolean EXT_framebuffer_sRGB;
    GLboolean EXT_gpu_program_parameters;
-- 
1.8.1.4