From: Kevin Rogovin <kevin.rogo...@intel.com>
Add extension flag and constant values for ARB_framebuffer_no_attachments.
---
src/mesa/main/extensions.c | 1 +
src/mesa/main/fbobject.c | 1 +
src/mesa/main/framebuffer.c | 1 +
src/mesa/main/mtypes.h | 52 ++++++++++++++++++++++++++++++++++++++++-----
4 files changed, 50 insertions(+), 5 deletions(-)
diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index 3d4965c..43b5c0b 100644
--- a/src/mesa/main/extensions.c
+++ b/src/mesa/main/extensions.c
@@ -118,6 +118,7 @@ static const struct extension extension_table[] = {
{ "GL_ARB_fragment_program_shadow",
o(ARB_fragment_program_shadow), GLL, 2003 },
{ "GL_ARB_fragment_shader", o(ARB_fragment_shader),
GL, 2002 },
{ "GL_ARB_framebuffer_object", o(ARB_framebuffer_object),
GL, 2005 },
+ { "GL_ARB_framebuffer_no_attachments",
o(ARB_framebuffer_no_attachments), GL, 2012 },
{ "GL_ARB_framebuffer_sRGB", o(EXT_framebuffer_sRGB),
GL, 1998 },
{ "GL_ARB_get_program_binary", o(dummy_true),
GL, 2010 },
{ "GL_ARB_gpu_shader5", o(ARB_gpu_shader5),
GLC, 2010 },
diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index 27cf97f..eabbb96 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -914,6 +914,7 @@ _mesa_test_framebuffer_completeness(struct gl_context *ctx,
fb->Height = 0;
fb->_AllColorBuffersFixedPoint = GL_TRUE;
fb->_HasSNormOrFloatColorBuffer = GL_FALSE;
+ fb->_HasAttachments = GL_TRUE;
/* Start at -2 to more easily loop over all attachment points.
* -2: depth buffer
diff --git a/src/mesa/main/framebuffer.c b/src/mesa/main/framebuffer.c
index 4f7736a..4e4d896 100644
--- a/src/mesa/main/framebuffer.c
+++ b/src/mesa/main/framebuffer.c
@@ -157,6 +157,7 @@ _mesa_initialize_window_framebuffer(struct gl_framebuffer
*fb,
fb->_Status = GL_FRAMEBUFFER_COMPLETE_EXT;
fb->_AllColorBuffersFixedPoint = !visual->floatMode;
fb->_HasSNormOrFloatColorBuffer = visual->floatMode;
+ fb->_HasAttachments = GL_TRUE;
compute_depth_max(fb);
}
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index fb41430..38a3817 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -3133,12 +3133,29 @@ struct gl_framebuffer
*/
struct gl_config Visual;
- GLuint Width, Height; /**< size of frame buffer in pixels */
+ /**
+ * size of frame buffer in pixels,
+ * no attachments has these values as 0
+ */
+ GLuint Width, Height;
+
+ /**
+ * In the case that the framebuffer has no attachment (i.e.
+ * GL_ARB_framebuffer_no_attachments) then the geometry of
+ * the framebuffer is specified by the default values.
+ */
+ struct {
+ GLuint Width, Height, Layers, NumSamples;
+ GLboolean FixedSampleLocations;
+ } DefaultGeometry;
- /** \name Drawing bounds (Intersection of buffer size and scissor box) */
+ /** \name Drawing bounds (Intersection of buffer size and scissor box)
+ * The drawing region is given by [_Xmin, _Xmax) x [_Ymin, _Ymax),
+ * (inclusive for _Xmin and _Ymin while exclusive for _Xmax and _Ymax)
+ */
/*@{*/
- GLint _Xmin, _Xmax; /**< inclusive */
- GLint _Ymin, _Ymax; /**< exclusive */
+ GLint _Xmin, _Xmax;
+ GLint _Ymin, _Ymax;
/*@}*/
/** \name Derived Z buffer stuff */
@@ -3151,6 +3168,20 @@ struct gl_framebuffer
/** One of the GL_FRAMEBUFFER_(IN)COMPLETE_* tokens */
GLenum _Status;
+ /** True if both of the conditions:
+ * - one of Attachment has gl_renderbuffer_attachment::Type != GL_NONE
+ * - _Status is GL_FRAMEBUFFER_COMPLETE_EXT
+ * NOTE: the values for Width and Height are set to 0 in the
+ * case of no attachments, a backend driver supporting
+ * GL_ARB_framebuffer_no_attachments must check for
+ * the flag _HasAttachments and if GL_FALSE, must then
+ * use the values in DefaultGeometry to initialize its
+ * viewport, scissor and so on (in particular _Xmin, _Xmax,
+ * _Ymin and _Ymax do NOT take into account _HasAttachments
+ * being false
+ */
+ GLboolean _HasAttachments;
+
/** Integer color values */
GLboolean _IntegerColor;
@@ -3161,7 +3192,9 @@ struct gl_framebuffer
/**
* The maximum number of layers in the framebuffer, or 0 if the framebuffer
* is not layered. For cube maps and cube map arrays, each cube face
- * counts as a layer.
+ * counts as a layer. As the case for Width, Height a backend driver
+ * supporting GL_ARB_framebuffer_no_attachments must use DefaultGeometry
+ * in the case that _HasAttachments is false
*/
GLuint MaxNumLayers;
@@ -3340,6 +3373,14 @@ struct gl_constants
GLuint MaxRenderbufferSize; /**< GL_EXT_framebuffer_object */
GLuint MaxSamples; /**< GL_ARB_framebuffer_object */
+ /**
+ * GL_ARB_framebuffer_no_attachments
+ */
+ GLuint MaxFramebufferWidth;
+ GLuint MaxFramebufferHeight;
+ GLuint MaxFramebufferLayers;
+ GLuint MaxFramebufferSamples;
+
/** Number of varying vectors between any two shader stages. */
GLuint MaxVarying;
@@ -3618,6 +3659,7 @@ struct gl_extensions
GLboolean ARB_fragment_program_shadow;
GLboolean ARB_fragment_shader;
GLboolean ARB_framebuffer_object;
+ GLboolean ARB_framebuffer_no_attachments;
GLboolean ARB_explicit_attrib_location;
GLboolean ARB_explicit_uniform_location;
GLboolean ARB_geometry_shader4;
--
1.9.1
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