DD: Refactor BlitFramebuffer.

In preparation for glBlitNamedFramebuffer, the DD table function
BlitFramebuffer needs to accept two arbitrary framebuffer objects rather
than assuming ctx->ReadBuffer and ctx->DrawBuffer.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

3 files changed, 35 insertions, 27 deletions

diff --git a/src/mesa/swrast/s_blit.c b/src/mesa/swrast/s_blit.c
index e3b45f1..48936d3 100644
--- a/src/mesa/swrast/s_blit.c
+++ b/src/mesa/swrast/s_blit.c
@@ -107,14 +107,14 @@ RESAMPLE(resample_row_16, GLuint, 4)
  */
 static void
 blit_nearest(struct gl_context *ctx,
+             struct gl_framebuffer *readFb,
+             struct gl_framebuffer *drawFb,
              GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
              GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
              GLbitfield buffer)
 {
    struct gl_renderbuffer *readRb, *drawRb = NULL;
    struct gl_renderbuffer_attachment *readAtt = NULL, *drawAtt = NULL;
-   struct gl_framebuffer *readFb = ctx->ReadBuffer;
-   struct gl_framebuffer *drawFb = ctx->DrawBuffer;
    GLuint numDrawBuffers = 0;
    GLuint i;
 
@@ -508,11 +508,11 @@ resample_linear_row_float(GLint srcWidth, GLint dstWidth,
  */
 static void
 blit_linear(struct gl_context *ctx,
+            struct gl_framebuffer *readFb,
+            struct gl_framebuffer *drawFb,
             GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
             GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1)
 {
-   struct gl_framebuffer *drawFb = ctx->DrawBuffer;
-   struct gl_framebuffer *readFb = ctx->ReadBuffer;
    struct gl_renderbuffer *readRb = readFb->_ColorReadBuffer;
    struct gl_renderbuffer_attachment *readAtt =
       &readFb->Attachment[readFb->_ColorReadBufferIndex];
@@ -733,6 +733,8 @@ fail_no_memory:
  */
 void
 _swrast_BlitFramebuffer(struct gl_context *ctx,
+                        struct gl_framebuffer *readFb,
+                        struct gl_framebuffer *drawFb,
                         GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
                         GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
                         GLbitfield mask, GLenum filter)
@@ -756,7 +758,7 @@ _swrast_BlitFramebuffer(struct gl_context *ctx,
    if (!_mesa_check_conditional_render(ctx))
       return; /* Do not blit */
 
-   if (!_mesa_clip_blit(ctx, &srcX0, &srcY0, &srcX1, &srcY1,
+   if (!_mesa_clip_blit(ctx, readFb, drawFb, &srcX0, &srcY0, &srcX1, &srcY1,
                         &dstX0, &dstY0, &dstX1, &dstY1)) {
       return;
    }
@@ -775,14 +777,15 @@ _swrast_BlitFramebuffer(struct gl_context *ctx,
        dstY0 < dstY1) {
       for (i = 0; i < 3; i++) {
          if (mask & buffers[i]) {
-	    if (swrast_fast_copy_pixels(ctx,
-					srcX0, srcY0,
-					srcX1 - srcX0, srcY1 - srcY0,
-					dstX0, dstY0,
-					buffer_enums[i])) {
-	       mask &= ~buffers[i];
-	    }
-	 }
+            if (swrast_fast_copy_pixels(ctx,
+                                        readFb, drawFb,
+                                        srcX0, srcY0,
+                                        srcX1 - srcX0, srcY1 - srcY0,
+                                        dstX0, dstY0,
+                                        buffer_enums[i])) {
+               mask &= ~buffers[i];
+            }
+         }
       }
 
       if (!mask)
@@ -791,17 +794,17 @@ _swrast_BlitFramebuffer(struct gl_context *ctx,
 
    if (filter == GL_NEAREST) {
       for (i = 0; i < 3; i++) {
-	 if (mask & buffers[i]) {
-	    blit_nearest(ctx,  srcX0, srcY0, srcX1, srcY1,
-			 dstX0, dstY0, dstX1, dstY1, buffers[i]);
-	 }
+          if (mask & buffers[i]) {
+             blit_nearest(ctx, readFb, drawFb, srcX0, srcY0, srcX1, srcY1,
+                          dstX0, dstY0, dstX1, dstY1, buffers[i]);
+          }
       }
    }
    else {
       ASSERT(filter == GL_LINEAR);
       if (mask & GL_COLOR_BUFFER_BIT) {  /* depth/stencil not allowed */
-	 blit_linear(ctx,  srcX0, srcY0, srcX1, srcY1,
-		     dstX0, dstY0, dstX1, dstY1);
+         blit_linear(ctx, readFb, drawFb, srcX0, srcY0, srcX1, srcY1,
+                     dstX0, dstY0, dstX1, dstY1);
       }
    }
 
diff --git a/src/mesa/swrast/s_copypix.c b/src/mesa/swrast/s_copypix.c
index d001734..eeea20e 100644
--- a/src/mesa/swrast/s_copypix.c
+++ b/src/mesa/swrast/s_copypix.c
@@ -442,11 +442,11 @@ end:
  */
 GLboolean
 swrast_fast_copy_pixels(struct gl_context *ctx,
-			GLint srcX, GLint srcY, GLsizei width, GLsizei height,
-			GLint dstX, GLint dstY, GLenum type)
+                        struct gl_framebuffer *srcFb,
+                        struct gl_framebuffer *dstFb,
+                        GLint srcX, GLint srcY, GLsizei width, GLsizei height,
+                        GLint dstX, GLint dstY, GLenum type)
 {
-   struct gl_framebuffer *srcFb = ctx->ReadBuffer;
-   struct gl_framebuffer *dstFb = ctx->DrawBuffer;
    struct gl_renderbuffer *srcRb, *dstRb;
    GLint row;
    GLuint pixelBytes, widthInBytes;
@@ -637,8 +637,9 @@ _swrast_CopyPixels( struct gl_context *ctx,
 	 ctx->Pixel.ZoomX != 1.0F ||
 	 ctx->Pixel.ZoomY != 1.0F ||
 	 ctx->_ImageTransferState) &&
-       swrast_fast_copy_pixels(ctx, srcx, srcy, width, height, destx, desty,
-			       type)) {
+      swrast_fast_copy_pixels(ctx, ctx->ReadBuffer, ctx->DrawBuffer,
+                              srcx, srcy, width, height, destx, desty,
+                              type)) {
       /* all done */
       return;
    }
diff --git a/src/mesa/swrast/swrast.h b/src/mesa/swrast/swrast.h
index ac3dbe3..8847bce 100644
--- a/src/mesa/swrast/swrast.h
+++ b/src/mesa/swrast/swrast.h
@@ -140,8 +140,10 @@ _swrast_CopyPixels( struct gl_context *ctx,
 
 extern GLboolean
 swrast_fast_copy_pixels(struct gl_context *ctx,
-			GLint srcX, GLint srcY, GLsizei width, GLsizei height,
-			GLint dstX, GLint dstY, GLenum type);
+                        struct gl_framebuffer *srcFb,
+                        struct gl_framebuffer *dstFb,
+                        GLint srcX, GLint srcY, GLsizei width, GLsizei height,
+                        GLint dstX, GLint dstY, GLenum type);
 
 extern void
 _swrast_DrawPixels( struct gl_context *ctx,
@@ -153,6 +155,8 @@ _swrast_DrawPixels( struct gl_context *ctx,
 
 extern void
 _swrast_BlitFramebuffer(struct gl_context *ctx,
+                        struct gl_framebuffer *readFb,
+                        struct gl_framebuffer *drawFb,
                         GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
                         GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
                         GLbitfield mask, GLenum filter);