From: Ian Romanick <ian.d.roman...@intel.com>
The OpenGL 3.2 core profile spec says:
"The following base internal formats from table 3.11 are
color-renderable: RED, RG, RGB, and RGBA. The sized internal formats
from table 3.12 that have a color-renderable base internal format
are also color-renderable. No other formats, including compressed
internal formats, are color-renderable."
The OpenGL 3.2 compatibility profile spec says (only ALPHA is added):
"The following base internal formats from table 3.16 are
color-renderable: ALPHA, RED, RG, RGB, and RGBA. The sized internal formats
from table 3.17 that have a color-renderable base internal format
are also color-renderable. No other formats, including compressed
internal formats, are color-renderable."
Table 3.12 in the core profile spec and table 3.17 in the compatibility
profile spec list SNORM formats as having a base internal format of RED,
RG, RGB, or RGBA. From this we infer that they should also be color
renderable.
The OpenGL ES 3.0 spec says:
"An internal format is color-renderable if it is one of the formats
from table 3.12 noted as color-renderable or if it is unsized format
RGBA or RGB. No other formats, including compressed internal
formats, are color-renderable."
In the OpenGL ES 3.0 spec, none of the SNORM formats have "color-
renderable" marked in table 3.12. The RGB I and UI formats also are not
color-renderable in ES3, but we'll save that change for another patch.
As a data point, NVIDIA's closed-source driver (version 304.64) rejects
*all* SNORM formats for renderbuffers in an OpenGL 4.x compatibility
profile.
Signed-off-by: Ian Romanick <ian.d.roman...@intel.com>
Cc: Matt Turner <matts...@gmail.com>
Cc: Marek Olšák <mar...@gmail.com>
---
src/mesa/main/fbobject.c | 38 ++++----------------------------------
1 file changed, 4 insertions(+), 34 deletions(-)
diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index ce77b9f..ab53bac 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -1169,35 +1169,23 @@ _mesa_base_fbo_format(struct gl_context *ctx, GLenum
internalFormat)
return ctx->API != API_OPENGLES && ctx->Extensions.ARB_texture_rg
? GL_RG : 0;
/* signed normalized texture formats */
- case GL_R8_SNORM:
- return ctx->Version >= 30
- || (ctx->API == API_OPENGL_COMPAT &&
ctx->Extensions.EXT_texture_snorm)
- ? GL_RED : 0;
case GL_RED_SNORM:
+ case GL_R8_SNORM:
case GL_R16_SNORM:
return _mesa_is_desktop_gl(ctx) && ctx->Extensions.EXT_texture_snorm
? GL_RED : 0;
- case GL_RG8_SNORM:
- return ctx->Version >= 30
- || (ctx->API == API_OPENGL_COMPAT &&
ctx->Extensions.EXT_texture_snorm)
- ? GL_RG : 0;
case GL_RG_SNORM:
+ case GL_RG8_SNORM:
case GL_RG16_SNORM:
return _mesa_is_desktop_gl(ctx) && ctx->Extensions.EXT_texture_snorm
? GL_RG : 0;
- case GL_RGB8_SNORM:
- return ctx->Version >= 30
- || (ctx->API == API_OPENGL_COMPAT &&
ctx->Extensions.EXT_texture_snorm)
- ? GL_RGB : 0;
case GL_RGB_SNORM:
+ case GL_RGB8_SNORM:
case GL_RGB16_SNORM:
return _mesa_is_desktop_gl(ctx) && ctx->Extensions.EXT_texture_snorm
? GL_RGB : 0;
- case GL_RGBA8_SNORM:
- return ctx->Version >= 30
- || (ctx->API == API_OPENGL_COMPAT &&
ctx->Extensions.EXT_texture_snorm)
- ? GL_RGBA : 0;
case GL_RGBA_SNORM:
+ case GL_RGBA8_SNORM:
case GL_RGBA16_SNORM:
return _mesa_is_desktop_gl(ctx) && ctx->Extensions.EXT_texture_snorm
? GL_RGBA : 0;
@@ -1207,24 +1195,6 @@ _mesa_base_fbo_format(struct gl_context *ctx, GLenum
internalFormat)
return ctx->API == API_OPENGL_COMPAT &&
ctx->Extensions.EXT_texture_snorm &&
ctx->Extensions.ARB_framebuffer_object ? GL_ALPHA : 0;
- case GL_LUMINANCE_SNORM:
- case GL_LUMINANCE8_SNORM:
- case GL_LUMINANCE16_SNORM:
- return ctx->API == API_OPENGL_COMPAT &&
- ctx->Extensions.EXT_texture_snorm &&
- ctx->Extensions.ARB_framebuffer_object ? GL_LUMINANCE : 0;
- case GL_LUMINANCE_ALPHA_SNORM:
- case GL_LUMINANCE8_ALPHA8_SNORM:
- case GL_LUMINANCE16_ALPHA16_SNORM:
- return ctx->API == API_OPENGL_COMPAT &&
- ctx->Extensions.EXT_texture_snorm &&
- ctx->Extensions.ARB_framebuffer_object ? GL_LUMINANCE_ALPHA : 0;
- case GL_INTENSITY_SNORM:
- case GL_INTENSITY8_SNORM:
- case GL_INTENSITY16_SNORM:
- return ctx->API == API_OPENGL_COMPAT &&
- ctx->Extensions.EXT_texture_snorm &&
- ctx->Extensions.ARB_framebuffer_object ? GL_INTENSITY : 0;
case GL_R16F:
case GL_R32F:
return ctx->Version >= 30
--
1.7.11.7
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