mesa: Move OES_read_format support from drivers into the core.

The assertion is that the correct read type to be using is the native
type of the underlying read renderbuffer.  For some fallback paths, this
may be worse than GL_RGBA/GL_UNSIGNED_BYTE for reads today, but it gets
all drivers the expected GL_BGRA/GL_UNSIGNED_BYTE for ARGB8888 or
GL_BGR//GL_UNSIGNED_SHORT_5_6_5_REV for rgb565 with no work.

This fixes the intel (and other) DRI drivers to report read formats that
should hit blit PBO readpixels paths.

6 files changed, 43 insertions, 17 deletions

diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index b5bf46718f..87eae96639 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -564,10 +564,6 @@ _mesa_init_constants(GLcontext *ctx)
    /* GL_ARB_draw_buffers */
    ctx->Const.MaxDrawBuffers = MAX_DRAW_BUFFERS;
 
-   /* GL_OES_read_format */
-   ctx->Const.ColorReadFormat = GL_RGBA;
-   ctx->Const.ColorReadType = GL_UNSIGNED_BYTE;
-
 #if FEATURE_EXT_framebuffer_object
    ctx->Const.MaxColorAttachments = MAX_COLOR_ATTACHMENTS;
    ctx->Const.MaxRenderbufferSize = MAX_WIDTH;
diff --git a/src/mesa/main/framebuffer.c b/src/mesa/main/framebuffer.c
index 154dedacd5..d958dbf7d4 100644
--- a/src/mesa/main/framebuffer.c
+++ b/src/mesa/main/framebuffer.c
@@ -969,3 +969,29 @@ _mesa_dest_buffer_exists(GLcontext *ctx, GLenum format)
    /* OK */
    return GL_TRUE;
 }
+
+GLenum
+_mesa_get_color_read_format(GLcontext *ctx)
+{
+   switch (ctx->ReadBuffer->_ColorReadBuffer->Format) {
+   case MESA_FORMAT_ARGB8888:
+      return GL_BGRA;
+   case MESA_FORMAT_RGB565:
+      return GL_BGR;
+   default:
+      return GL_RGBA;
+   }
+}
+
+GLenum
+_mesa_get_color_read_type(GLcontext *ctx)
+{
+   switch (ctx->ReadBuffer->_ColorReadBuffer->Format) {
+   case MESA_FORMAT_ARGB8888:
+      return GL_UNSIGNED_BYTE;
+   case MESA_FORMAT_RGB565:
+      return GL_UNSIGNED_SHORT_5_6_5_REV;
+   default:
+      return GL_UNSIGNED_BYTE;
+   }
+}
diff --git a/src/mesa/main/framebuffer.h b/src/mesa/main/framebuffer.h
index 45a4703ba9..ef21dd98e8 100644
--- a/src/mesa/main/framebuffer.h
+++ b/src/mesa/main/framebuffer.h
@@ -81,5 +81,10 @@ _mesa_source_buffer_exists(GLcontext *ctx, GLenum format);
 extern GLboolean
 _mesa_dest_buffer_exists(GLcontext *ctx, GLenum format);
 
+extern GLenum
+_mesa_get_color_read_type(GLcontext *ctx);
+
+extern GLenum
+_mesa_get_color_read_format(GLcontext *ctx);
 
 #endif /* FRAMEBUFFER_H */
diff --git a/src/mesa/main/get.c b/src/mesa/main/get.c
index 6c5ce02913..3f6b03c88a 100644
--- a/src/mesa/main/get.c
+++ b/src/mesa/main/get.c
@@ -13,6 +13,7 @@
 #include "mtypes.h"
 #include "state.h"
 #include "texcompress.h"
+#include "framebuffer.h"
 
 
 #define FLOAT_TO_BOOLEAN(X)   ( (X) ? GL_TRUE : GL_FALSE )
@@ -1767,11 +1768,11 @@ _mesa_GetBooleanv( GLenum pname, GLboolean *params )
          break;
       case GL_IMPLEMENTATION_COLOR_READ_TYPE_OES:
          CHECK_EXT1(OES_read_format, "GetBooleanv");
-         params[0] = INT_TO_BOOLEAN(ctx->Const.ColorReadType);
+         params[0] = INT_TO_BOOLEAN(_mesa_get_color_read_type(ctx));
          break;
       case GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES:
          CHECK_EXT1(OES_read_format, "GetBooleanv");
-         params[0] = INT_TO_BOOLEAN(ctx->Const.ColorReadFormat);
+         params[0] = INT_TO_BOOLEAN(_mesa_get_color_read_format(ctx));
          break;
       case GL_NUM_FRAGMENT_REGISTERS_ATI:
          CHECK_EXT1(ATI_fragment_shader, "GetBooleanv");
@@ -3602,11 +3603,11 @@ _mesa_GetFloatv( GLenum pname, GLfloat *params )
          break;
       case GL_IMPLEMENTATION_COLOR_READ_TYPE_OES:
          CHECK_EXT1(OES_read_format, "GetFloatv");
-         params[0] = (GLfloat)(ctx->Const.ColorReadType);
+         params[0] = (GLfloat)(_mesa_get_color_read_type(ctx));
          break;
       case GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES:
          CHECK_EXT1(OES_read_format, "GetFloatv");
-         params[0] = (GLfloat)(ctx->Const.ColorReadFormat);
+         params[0] = (GLfloat)(_mesa_get_color_read_format(ctx));
          break;
       case GL_NUM_FRAGMENT_REGISTERS_ATI:
          CHECK_EXT1(ATI_fragment_shader, "GetFloatv");
@@ -5437,11 +5438,11 @@ _mesa_GetIntegerv( GLenum pname, GLint *params )
          break;
       case GL_IMPLEMENTATION_COLOR_READ_TYPE_OES:
          CHECK_EXT1(OES_read_format, "GetIntegerv");
-         params[0] = ctx->Const.ColorReadType;
+         params[0] = _mesa_get_color_read_type(ctx);
          break;
       case GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES:
          CHECK_EXT1(OES_read_format, "GetIntegerv");
-         params[0] = ctx->Const.ColorReadFormat;
+         params[0] = _mesa_get_color_read_format(ctx);
          break;
       case GL_NUM_FRAGMENT_REGISTERS_ATI:
          CHECK_EXT1(ATI_fragment_shader, "GetIntegerv");
@@ -7273,11 +7274,11 @@ _mesa_GetInteger64v( GLenum pname, GLint64 *params )
          break;
       case GL_IMPLEMENTATION_COLOR_READ_TYPE_OES:
          CHECK_EXT1(OES_read_format, "GetInteger64v");
-         params[0] = (GLint64)(ctx->Const.ColorReadType);
+         params[0] = (GLint64)(_mesa_get_color_read_type(ctx));
          break;
       case GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES:
          CHECK_EXT1(OES_read_format, "GetInteger64v");
-         params[0] = (GLint64)(ctx->Const.ColorReadFormat);
+         params[0] = (GLint64)(_mesa_get_color_read_format(ctx));
          break;
       case GL_NUM_FRAGMENT_REGISTERS_ATI:
          CHECK_EXT1(ATI_fragment_shader, "GetInteger64v");
diff --git a/src/mesa/main/get_gen.py b/src/mesa/main/get_gen.py
index 930c3362fa..697c4cfd92 100644
--- a/src/mesa/main/get_gen.py
+++ b/src/mesa/main/get_gen.py
@@ -942,9 +942,9 @@ StateVars = [
 
 	# GL_OES_read_format
 	( "GL_IMPLEMENTATION_COLOR_READ_TYPE_OES", GLint,
-	  ["ctx->Const.ColorReadType"], "", ["OES_read_format"] ),
+	  ["_mesa_get_color_read_type(ctx)"], "", ["OES_read_format"] ),
 	( "GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES", GLint,
-	  ["ctx->Const.ColorReadFormat"], "", ["OES_read_format"] ),
+	  ["_mesa_get_color_read_format(ctx)"], "", ["OES_read_format"] ),
 
 	# GL_ATI_fragment_shader
 	( "GL_NUM_FRAGMENT_REGISTERS_ATI", GLint, ["6"], "", ["ATI_fragment_shader"] ),
@@ -1159,6 +1159,7 @@ def EmitHeader():
 #include "mtypes.h"
 #include "state.h"
 #include "texcompress.h"
+#include "framebuffer.h"
 
 
 #define FLOAT_TO_BOOLEAN(X)   ( (X) ? GL_TRUE : GL_FALSE )
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 881d233ca3..cde2f5fe06 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2355,9 +2355,6 @@ struct gl_constants
 
    GLuint MaxDrawBuffers;    /**< GL_ARB_draw_buffers */
 
-   GLenum ColorReadFormat;   /**< GL_OES_read_format */
-   GLenum ColorReadType;     /**< GL_OES_read_format */
-
    GLuint MaxColorAttachments;   /**< GL_EXT_framebuffer_object */
    GLuint MaxRenderbufferSize;   /**< GL_EXT_framebuffer_object */
    GLuint MaxSamples;            /**< GL_ARB_framebuffer_object */