#include "enums.h"
#include "fbobject.h"
#include "mtypes.h"
+#include "util/bitscan.h"
#define BAD_MASK ~0u
* return -1 for an invalid buffer.
*/
static gl_buffer_index
-read_buffer_enum_to_index(GLenum buffer)
+read_buffer_enum_to_index(const struct gl_context *ctx, GLenum buffer)
{
switch (buffer) {
case GL_FRONT:
return BUFFER_FRONT_LEFT;
case GL_BACK:
+ if (_mesa_is_gles(ctx)) {
+ /* In draw_buffer_enum_to_bitmask, when GLES contexts draw to
+ * GL_BACK with a single-buffered configuration, we actually end
+ * up drawing to the sole front buffer in our internal
+ * representation. For consistency, we must read from that
+ * front left buffer too.
+ */
+ if (!ctx->DrawBuffer->Visual.doubleBufferMode)
+ return BUFFER_FRONT_LEFT;
+ }
return BUFFER_BACK_LEFT;
case GL_RIGHT:
return BUFFER_FRONT_RIGHT;
/* complicated error checking... */
for (output = 0; output < n; output++) {
- /* Section 4.2 (Whole Framebuffer Operations) of the OpenGL 3.0
+ 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 4.0 specification, page 256:
+ * "For both the default framebuffer and framebuffer objects, the
+ * constants FRONT, BACK, LEFT, RIGHT, and FRONT_AND_BACK are not
+ * valid in the bufs array passed to DrawBuffers, and will result in
+ * the error INVALID_ENUM. This restriction is because these
+ * constants may themselves refer to multiple buffers, as shown in
+ * table 4.4."
+ * Previous versions of the OpenGL specification say INVALID_OPERATION,
+ * but the Khronos conformance tests expect INVALID_ENUM.
+ */
+ if (_mesa_bitcount(destMask[output]) > 1) {
+ _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:
*
- * "Each buffer listed in bufs must be BACK, NONE, or one of the values
- * from table 4.3 (NONE, COLOR_ATTACHMENTi)"
+ * "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) && buffers[output] != GL_NONE &&
- buffers[output] != GL_BACK &&
+ 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_ENUM, "glDrawBuffers(buffer)");
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffers(buffer)");
return;
}
return;
}
- 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 4.0 specification, page 256:
- * "For both the default framebuffer and framebuffer objects, the
- * constants FRONT, BACK, LEFT, RIGHT, and FRONT_AND_BACK are not
- * valid in the bufs array passed to DrawBuffers, and will result in
- * the error INVALID_ENUM. This restriction is because these
- * constants may themselves refer to multiple buffers, as shown in
- * table 4.4."
- * Previous versions of the OpenGL specification say INVALID_OPERATION,
- * but the Khronos conformance tests expect INVALID_ENUM.
- */
- if (_mesa_bitcount(destMask[output]) > 1) {
- _mesa_error(ctx, GL_INVALID_ENUM, "%s(invalid buffer %s)",
- caller, _mesa_enum_to_string(buffers[output]));
- return;
- }
-
/* From the OpenGL 3.0 specification, page 259:
* "If the GL is bound to the default framebuffer and DrawBuffers is
* supplied with a constant (other than NONE) that does not indicate
if (n > 0 && _mesa_bitcount(destMask[0]) > 1) {
GLuint count = 0, destMask0 = destMask[0];
while (destMask0) {
- GLint bufIndex = ffs(destMask0) - 1;
+ const int bufIndex = u_bit_scan(&destMask0);
if (fb->_ColorDrawBufferIndexes[count] != bufIndex) {
updated_drawbuffers(ctx, fb);
fb->_ColorDrawBufferIndexes[count] = bufIndex;
}
count++;
- destMask0 &= ~(1 << bufIndex);
}
fb->ColorDrawBuffer[0] = buffers[0];
fb->_NumColorDrawBuffers = count;
if (_mesa_is_gles3(ctx) && !is_legal_es3_readbuffer_enum(buffer))
srcBuffer = -1;
else
- srcBuffer = read_buffer_enum_to_index(buffer);
+ srcBuffer = read_buffer_enum_to_index(ctx, buffer);
if (srcBuffer == -1) {
_mesa_error(ctx, GL_INVALID_ENUM,
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