* that is considered special and allowed as far as n is one
* since 4.5.
*/
-static void
-draw_buffers(struct gl_context *ctx, struct gl_framebuffer *fb,
- GLsizei n, const GLenum *buffers, const char *caller)
+static ALWAYS_INLINE void
+draw_buffers(struct gl_context *ctx, struct gl_framebuffer *fb, GLsizei n,
+ const GLenum *buffers, const char *caller, bool no_error)
{
GLuint output;
GLbitfield usedBufferMask, supportedMask;
FLUSH_VERTICES(ctx, 0);
- /* Turns out n==0 is a valid input that should not produce an error.
- * The remaining code below correctly handles the n==0 case.
- *
- * From the OpenGL 3.0 specification, page 258:
- * "An INVALID_VALUE error is generated if n is greater than
- * MAX_DRAW_BUFFERS."
- */
- if (n < 0) {
- _mesa_error(ctx, GL_INVALID_VALUE, "%s(n < 0)", caller);
- return;
- }
+ if (!no_error) {
+ /* Turns out n==0 is a valid input that should not produce an error.
+ * The remaining code below correctly handles the n==0 case.
+ *
+ * From the OpenGL 3.0 specification, page 258:
+ * "An INVALID_VALUE error is generated if n is greater than
+ * MAX_DRAW_BUFFERS."
+ */
+ if (n < 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "%s(n < 0)", caller);
+ return;
+ }
- if (n > (GLsizei) ctx->Const.MaxDrawBuffers) {
- _mesa_error(ctx, GL_INVALID_VALUE,
- "%s(n > maximum number of draw buffers)", caller);
- return;
+ if (n > (GLsizei) ctx->Const.MaxDrawBuffers) {
+ _mesa_error(ctx, GL_INVALID_VALUE,
+ "%s(n > maximum number of draw buffers)", caller);
+ return;
+ }
+
+ /* From the ES 3.0 specification, page 180:
+ * "If the GL is bound to the default framebuffer, then n must be 1
+ * and the constant must be BACK or NONE."
+ * (same restriction applies with GL_EXT_draw_buffers specification)
+ */
+ if (ctx->API == API_OPENGLES2 && _mesa_is_winsys_fbo(fb) &&
+ (n != 1 || (buffers[0] != GL_NONE && buffers[0] != GL_BACK))) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "%s(invalid buffers)", caller);
+ return;
+ }
}
supportedMask = supported_buffer_bitmask(ctx, fb);
usedBufferMask = 0x0;
- /* From the ES 3.0 specification, page 180:
- * "If the GL is bound to the default framebuffer, then n must be 1
- * and the constant must be BACK or NONE."
- * (same restriction applies with GL_EXT_draw_buffers specification)
- */
- if (ctx->API == API_OPENGLES2 && _mesa_is_winsys_fbo(fb) &&
- (n != 1 || (buffers[0] != GL_NONE && buffers[0] != GL_BACK))) {
- _mesa_error(ctx, GL_INVALID_OPERATION, "%s(invalid buffers)", caller);
- return;
- }
-
/* complicated error checking... */
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) {
* 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)",
* 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 */
}
+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");
}
else
fb = ctx->WinSysDrawBuffer;
- draw_buffers(ctx, fb, n, bufs, "glNamedFramebufferDrawBuffers");
+ draw_buffers_error(ctx, fb, n, bufs, "glNamedFramebufferDrawBuffers");
}
projects / mesa.git / commitdiff