@@ -435,65 +437,67 @@ draw_buffers(struct gl_context *ctx, struct
gl_framebuffer *fb,
for (output = 0; output < n; output++) {
destMask[output] = draw_buffer_enum_to_bitmask(ctx,
buffers[output]);
- /* From the OpenGL 3.0 specification, page 258:
- * "Each buffer listed in bufs must be one of the values from
tables
- * 4.5 or 4.6. Otherwise, an INVALID_ENUM error is generated.
- */
- if (destMask[output] == BAD_MASK) {
- _mesa_error(ctx, GL_INVALID_ENUM, "%s(invalid buffer %s)",
- caller, _mesa_enum_to_string(buffers[output]));
- return;
- }
-
- /* From the OpenGL 4.5 specification, page 493 (page 515 of the
PDF)
- * "An INVALID_ENUM error is generated if any value in bufs is
FRONT,
- * LEFT, RIGHT, or FRONT_AND_BACK . This restriction applies
to both
- * the default framebuffer and framebuffer objects, and exists
because
- * these constants may themselves refer to multiple buffers,
as shown
- * in table 17.4."
- *
- * And on page 492 (page 514 of the PDF):
- * "If the default framebuffer is affected, then each of the
constants
- * must be one of the values listed in table 17.6 or the
special value
- * BACK. When BACK is used, n must be 1 and color values are
written
- * into the left buffer for single-buffered contexts, or into
the back
- * left buffer for double-buffered contexts."
- *
- * Note "special value BACK". GL_BACK also refers to multiple
buffers,
- * but it is consider a special case here. This is a change on
4.5. For
- * OpenGL 4.x we check that behaviour. For any previous version
we keep
- * considering it wrong (as INVALID_ENUM).
- */
- if (_mesa_bitcount(destMask[output]) > 1) {
- if (_mesa_is_winsys_fbo(fb) && ctx->Version >= 40 &&
- buffers[output] == GL_BACK) {
- if (n != 1) {
- _mesa_error(ctx, GL_INVALID_OPERATION, "%s(with
GL_BACK n must be 1)",
- caller);
- return;
- }
- } else {
+ if (!no_error) {
+ /* From the OpenGL 3.0 specification, page 258:
+ * "Each buffer listed in bufs must be one of the values
from tables
+ * 4.5 or 4.6. Otherwise, an INVALID_ENUM error is generated.
+ */
+ if (destMask[output] == BAD_MASK) {
_mesa_error(ctx, GL_INVALID_ENUM, "%s(invalid buffer %s)",
caller, _mesa_enum_to_string(buffers[output]));
return;
}
- }
- /* Section 4.2 (Whole Framebuffer Operations) of the OpenGL ES 3.0
- * specification says:
- *
- * "If the GL is bound to a draw framebuffer object, the
ith buffer
- * listed in bufs must be COLOR_ATTACHMENTi or NONE .
Specifying a
- * buffer out of order, BACK , or COLOR_ATTACHMENTm where m
is greater
- * than or equal to the value of MAX_- COLOR_ATTACHMENTS ,
will
- * generate the error INVALID_OPERATION .
- */
- if (_mesa_is_gles3(ctx) && _mesa_is_user_fbo(fb) &&
- buffers[output] != GL_NONE &&
- (buffers[output] < GL_COLOR_ATTACHMENT0 ||
- buffers[output] >= GL_COLOR_ATTACHMENT0 +
ctx->Const.MaxColorAttachments)) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
"glDrawBuffers(buffer)");
- return;
+ /* From the OpenGL 4.5 specification, page 493 (page 515 of
the PDF)
+ * "An INVALID_ENUM error is generated if any value in bufs
is FRONT,
+ * LEFT, RIGHT, or FRONT_AND_BACK . This restriction applies
to both
+ * the default framebuffer and framebuffer objects, and
exists because
+ * these constants may themselves refer to multiple buffers,
as shown
+ * in table 17.4."
+ *
+ * And on page 492 (page 514 of the PDF):
+ * "If the default framebuffer is affected, then each of the
constants
+ * must be one of the values listed in table 17.6 or the
special value
+ * BACK. When BACK is used, n must be 1 and color values are
written
+ * into the left buffer for single-buffered contexts, or
into the back
+ * left buffer for double-buffered contexts."
+ *
+ * Note "special value BACK". GL_BACK also refers to
multiple buffers,
+ * but it is consider a special case here. This is a change
on 4.5.
+ * For OpenGL 4.x we check that behaviour. For any previous
version we
+ * keep considering it wrong (as INVALID_ENUM).
+ */
+ if (_mesa_bitcount(destMask[output]) > 1) {
+ if (_mesa_is_winsys_fbo(fb) && ctx->Version >= 40 &&
+ buffers[output] == GL_BACK) {
+ if (n != 1) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "%s(with
GL_BACK n must be 1)",
+ caller);
+ return;
+ }
+ } else {
+ _mesa_error(ctx, GL_INVALID_ENUM, "%s(invalid buffer
%s)",
+ caller,
_mesa_enum_to_string(buffers[output]));
+ return;
+ }
+ }
+
+ /* Section 4.2 (Whole Framebuffer Operations) of the OpenGL
ES 3.0
+ * specification says:
+ *
+ * "If the GL is bound to a draw framebuffer object, the
ith
+ * buffer listed in bufs must be COLOR_ATTACHMENTi or
NONE .
+ * Specifying a buffer out of order, BACK , or
COLOR_ATTACHMENTm
+ * where m is greater than or equal to the value of MAX_-
+ * COLOR_ATTACHMENTS , will generate the error
INVALID_OPERATION .
+ */
+ if (_mesa_is_gles3(ctx) && _mesa_is_user_fbo(fb) &&
+ buffers[output] != GL_NONE &&
+ (buffers[output] < GL_COLOR_ATTACHMENT0 ||
+ buffers[output] >= GL_COLOR_ATTACHMENT0 +
ctx->Const.MaxColorAttachments)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
"glDrawBuffers(buffer)");
+ return;
+ }
}
if (buffers[output] == GL_NONE) {
@@ -508,7 +512,7 @@ draw_buffers(struct gl_context *ctx, struct
gl_framebuffer *fb,
* or equal to the value of MAX_COLOR_ATTACHMENTS, then
the error
* INVALID_OPERATION results."
*/
- if (_mesa_is_user_fbo(fb) && buffers[output] >=
+ if (!no_error && _mesa_is_user_fbo(fb) && buffers[output] >=
GL_COLOR_ATTACHMENT0 + ctx->Const.MaxDrawBuffers) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"%s(buffers[%d] >= maximum number of draw
buffers)",
@@ -527,37 +531,40 @@ draw_buffers(struct gl_context *ctx, struct
gl_framebuffer *fb,
* INVALID_OPERATION results."
*/
destMask[output] &= supportedMask;
- if (destMask[output] == 0) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "%s(unsupported buffer %s)",
- caller, _mesa_enum_to_string(buffers[output]));
- return;
- }
+ if (!no_error) {
+ if (destMask[output] == 0) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "%s(unsupported buffer %s)",
+ caller,
_mesa_enum_to_string(buffers[output]));
+ return;
+ }
- /* ES 3.0 is even more restrictive. From the ES 3.0 spec,
page 180:
- * "If the GL is bound to a framebuffer object, the ith
buffer listed
- * in bufs must be COLOR_ATTACHMENTi or NONE. [...]
INVALID_OPERATION."
- * (same restriction applies with GL_EXT_draw_buffers
specification)
- */
- if (ctx->API == API_OPENGLES2 && _mesa_is_user_fbo(fb) &&
- buffers[output] != GL_NONE &&
- buffers[output] != GL_COLOR_ATTACHMENT0 + output) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "%s(unsupported buffer %s)",
- caller, _mesa_enum_to_string(buffers[output]));
- return;
- }
+ /* ES 3.0 is even more restrictive. From the ES 3.0
spec, page 180:
+ * "If the GL is bound to a framebuffer object, the ith
buffer
+ * listed in bufs must be COLOR_ATTACHMENTi or NONE. [...]
+ * INVALID_OPERATION." (same restriction applies with
+ * GL_EXT_draw_buffers specification)
+ */
+ if (ctx->API == API_OPENGLES2 && _mesa_is_user_fbo(fb) &&
+ buffers[output] != GL_NONE &&
+ buffers[output] != GL_COLOR_ATTACHMENT0 + output) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "%s(unsupported buffer %s)",
+ caller,
_mesa_enum_to_string(buffers[output]));
+ return;
+ }
- /* From the OpenGL 3.0 specification, page 258:
- * "Except for NONE, a buffer may not appear more than once
in the
- * array pointed to by bufs. Specifying a buffer more then
once will
- * result in the error INVALID_OPERATION."
- */
- if (destMask[output] & usedBufferMask) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "%s(duplicated buffer %s)",
- caller, _mesa_enum_to_string(buffers[output]));
- return;
+ /* From the OpenGL 3.0 specification, page 258:
+ * "Except for NONE, a buffer may not appear more than
once in the
+ * array pointed to by bufs. Specifying a buffer more
then once
+ * will result in the error INVALID_OPERATION."
+ */
+ if (destMask[output] & usedBufferMask) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "%s(duplicated buffer %s)",
+ caller,
_mesa_enum_to_string(buffers[output]));
+ return;
+ }
}
/* update bitmask */
@@ -583,11 +590,19 @@ draw_buffers(struct gl_context *ctx, struct
gl_framebuffer *fb,
}
+static void
+draw_buffers_error(struct gl_context *ctx, struct gl_framebuffer *fb,
GLsizei n,
+ const GLenum *buffers, const char *caller)
+{
+ draw_buffers(ctx, fb, n, buffers, caller, false);
+}
+
+
void GLAPIENTRY
_mesa_DrawBuffers(GLsizei n, const GLenum *buffers)
{
GET_CURRENT_CONTEXT(ctx);
- draw_buffers(ctx, ctx->DrawBuffer, n, buffers, "glDrawBuffers");
+ draw_buffers_error(ctx, ctx->DrawBuffer, n, buffers,
"glDrawBuffers");
}
@@ -607,7 +622,7 @@ _mesa_NamedFramebufferDrawBuffers(GLuint
framebuffer, GLsizei n,
else
fb = ctx->WinSysDrawBuffer;
- draw_buffers(ctx, fb, n, bufs, "glNamedFramebufferDrawBuffers");
+ draw_buffers_error(ctx, fb, n, bufs,
"glNamedFramebufferDrawBuffers");
}
