/*
* Mesa 3-D graphics library
- * Version: 7.1
*
* Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
*/
#include "glheader.h"
#include "buffers.h"
-#include "colormac.h"
#include "context.h"
#include "enums.h"
+#include "fbobject.h"
+#include "hash.h"
#include "mtypes.h"
+#include "util/bitscan.h"
+#include "util/u_math.h"
#define BAD_MASK ~0u
* \return bitmask of BUFFER_BIT_* flags
*/
static GLbitfield
-supported_buffer_bitmask(const struct gl_context *ctx, const struct gl_framebuffer *fb)
+supported_buffer_bitmask(const struct gl_context *ctx,
+ const struct gl_framebuffer *fb)
{
GLbitfield mask = 0x0;
- if (fb->Name > 0) {
+ if (_mesa_is_user_fbo(fb)) {
/* A user-created renderbuffer */
- GLuint i;
- ASSERT(ctx->Extensions.EXT_framebuffer_object);
- for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
- mask |= (BUFFER_BIT_COLOR0 << i);
- }
+ mask = ((1 << ctx->Const.MaxColorAttachments) - 1) << BUFFER_COLOR0;
}
else {
/* A window system framebuffer */
return mask;
}
+GLenum
+_mesa_back_to_front_if_single_buffered(const struct gl_framebuffer *fb,
+ GLenum buffer)
+{
+ /* If the front buffer is the only buffer, GL_BACK and all other flags
+ * that include BACK select the front buffer for drawing. There are
+ * several reasons we want to do this.
+ *
+ * 1) OpenGL ES 3.0 requires it:
+ *
+ * Page 181 (page 192 of the PDF) in section 4.2.1 of the OpenGL
+ * ES 3.0.1 specification says:
+ *
+ * "When draw buffer zero is BACK, color values are written
+ * into the sole buffer for single-buffered contexts, or into
+ * the back buffer for double-buffered contexts."
+ *
+ * We also do this for GLES 1 and 2 because those APIs have no
+ * concept of selecting the front and back buffer anyway and it's
+ * convenient to be able to maintain the magic behaviour of
+ * GL_BACK in that case.
+ *
+ * 2) Pbuffers are back buffers from the application point of view,
+ * but they are front buffers from the Mesa point of view,
+ * because they are always single buffered.
+ */
+ if (!fb->Visual.doubleBufferMode) {
+ switch (buffer) {
+ case GL_BACK:
+ buffer = GL_FRONT;
+ break;
+ case GL_BACK_RIGHT:
+ buffer = GL_FRONT_RIGHT;
+ break;
+ case GL_BACK_LEFT:
+ buffer = GL_FRONT_LEFT;
+ break;
+ }
+ }
+
+ return buffer;
+}
/**
* Helper routine used by glDrawBuffer and glDrawBuffersARB.
* GL_FRONT_AND_BACK), return the corresponding bitmask of BUFFER_BIT_* flags.
*/
static GLbitfield
-draw_buffer_enum_to_bitmask(GLenum buffer)
+draw_buffer_enum_to_bitmask(const struct gl_context *ctx, GLenum buffer)
{
+ buffer = _mesa_back_to_front_if_single_buffered(ctx->DrawBuffer, buffer);
+
switch (buffer) {
case GL_NONE:
return 0;
case GL_COLOR_ATTACHMENT7_EXT:
return BUFFER_BIT_COLOR7;
default:
+ /* not an error, but also not supported */
+ if (buffer >= GL_COLOR_ATTACHMENT8 && buffer <= GL_COLOR_ATTACHMENT31)
+ return 1 << BUFFER_COUNT;
/* error */
return BAD_MASK;
}
* Helper routine used by glReadBuffer.
* Given a GLenum naming a color buffer, return the index of the corresponding
* renderbuffer (a BUFFER_* value).
- * return -1 for an invalid buffer.
+ * return BUFFER_NONE for an invalid buffer.
*/
-static GLint
-read_buffer_enum_to_index(GLenum buffer)
+static gl_buffer_index
+read_buffer_enum_to_index(const struct gl_context *ctx, GLenum buffer)
{
+ buffer = _mesa_back_to_front_if_single_buffered(ctx->ReadBuffer, buffer);
+
switch (buffer) {
case GL_FRONT:
return BUFFER_FRONT_LEFT;
return BUFFER_FRONT_LEFT;
case GL_AUX0:
return BUFFER_AUX0;
+ case GL_FRONT_AND_BACK:
+ return BUFFER_FRONT_LEFT;
case GL_AUX1:
case GL_AUX2:
case GL_AUX3:
case GL_COLOR_ATTACHMENT7_EXT:
return BUFFER_COLOR7;
default:
+ /* not an error, but also not supported */
+ if (buffer >= GL_COLOR_ATTACHMENT8 && buffer <= GL_COLOR_ATTACHMENT31)
+ return BUFFER_COUNT;
/* error */
- return -1;
+ return BUFFER_NONE;
}
}
+static bool
+is_legal_es3_readbuffer_enum(GLenum buf)
+{
+ return buf == GL_BACK || buf == GL_NONE ||
+ (buf >= GL_COLOR_ATTACHMENT0 && buf <= GL_COLOR_ATTACHMENT31);
+}
/**
- * Called by glDrawBuffer().
+ * Called by glDrawBuffer() and glNamedFramebufferDrawBuffer().
* Specify which renderbuffer(s) to draw into for the first color output.
* <buffer> can name zero, one, two or four renderbuffers!
- * \sa _mesa_DrawBuffersARB
+ * \sa _mesa_DrawBuffers
*
* \param buffer buffer token such as GL_LEFT or GL_FRONT_AND_BACK, etc.
*
* Note that the behaviour of this function depends on whether the
- * current ctx->DrawBuffer is a window-system framebuffer (Name=0) or
- * a user-created framebuffer object (Name!=0).
+ * current ctx->DrawBuffer is a window-system framebuffer or a user-created
+ * framebuffer object.
* In the former case, we update the per-context ctx->Color.DrawBuffer
* state var _and_ the FB's ColorDrawBuffer state.
* In the later case, we update the FB's ColorDrawBuffer state only.
*
* See the GL_EXT_framebuffer_object spec for more info.
*/
-void GLAPIENTRY
-_mesa_DrawBuffer(GLenum buffer)
+static ALWAYS_INLINE void
+draw_buffer(struct gl_context *ctx, struct gl_framebuffer *fb,
+ GLenum buffer, const char *caller, bool no_error)
{
GLbitfield destMask;
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* too complex... */
+
+ FLUSH_VERTICES(ctx, 0);
if (MESA_VERBOSE & VERBOSE_API) {
- _mesa_debug(ctx, "glDrawBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
+ _mesa_debug(ctx, "%s %s\n", caller, _mesa_enum_to_string(buffer));
}
if (buffer == GL_NONE) {
}
else {
const GLbitfield supportedMask
- = supported_buffer_bitmask(ctx, ctx->DrawBuffer);
- destMask = draw_buffer_enum_to_bitmask(buffer);
- if (destMask == BAD_MASK) {
+ = supported_buffer_bitmask(ctx, fb);
+ destMask = draw_buffer_enum_to_bitmask(ctx, buffer);
+ if (!no_error && destMask == BAD_MASK) {
/* totally bogus buffer */
- _mesa_error(ctx, GL_INVALID_ENUM, "glDrawBuffer(buffer=0x%x)", buffer);
+ _mesa_error(ctx, GL_INVALID_ENUM, "%s(invalid buffer %s)", caller,
+ _mesa_enum_to_string(buffer));
return;
}
destMask &= supportedMask;
- if (destMask == 0x0) {
+ if (!no_error && destMask == 0x0) {
/* none of the named color buffers exist! */
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glDrawBuffer(buffer=0x%x)", buffer);
+ _mesa_error(ctx, GL_INVALID_OPERATION, "%s(invalid buffer %s)",
+ caller, _mesa_enum_to_string(buffer));
return;
}
}
/* if we get here, there's no error so set new state */
- _mesa_drawbuffers(ctx, 1, &buffer, &destMask);
+ const GLenum16 buffer16 = buffer;
+ _mesa_drawbuffers(ctx, fb, 1, &buffer16, &destMask);
- /*
- * Call device driver function.
- */
- if (ctx->Driver.DrawBuffers)
- ctx->Driver.DrawBuffers(ctx, 1, &buffer);
- else if (ctx->Driver.DrawBuffer)
- ctx->Driver.DrawBuffer(ctx, buffer);
+ /* Call device driver function only if fb is the bound draw buffer */
+ if (fb == ctx->DrawBuffer) {
+ if (ctx->Driver.DrawBuffer)
+ ctx->Driver.DrawBuffer(ctx);
+ if (ctx->Driver.DrawBufferAllocate)
+ ctx->Driver.DrawBufferAllocate(ctx);
+ }
+}
+
+
+static void
+draw_buffer_error(struct gl_context *ctx, struct gl_framebuffer *fb,
+ GLenum buffer, const char *caller)
+{
+ draw_buffer(ctx, fb, buffer, caller, false);
+}
+
+
+static void
+draw_buffer_no_error(struct gl_context *ctx, struct gl_framebuffer *fb,
+ GLenum buffer, const char *caller)
+{
+ draw_buffer(ctx, fb, buffer, caller, true);
+}
+
+
+void GLAPIENTRY
+_mesa_DrawBuffer_no_error(GLenum buffer)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ draw_buffer_no_error(ctx, ctx->DrawBuffer, buffer, "glDrawBuffer");
+}
+
+
+void GLAPIENTRY
+_mesa_DrawBuffer(GLenum buffer)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ draw_buffer_error(ctx, ctx->DrawBuffer, buffer, "glDrawBuffer");
+}
+
+
+void GLAPIENTRY
+_mesa_NamedFramebufferDrawBuffer_no_error(GLuint framebuffer, GLenum buf)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ struct gl_framebuffer *fb;
+
+ if (framebuffer) {
+ fb = _mesa_lookup_framebuffer(ctx, framebuffer);
+ } else {
+ fb = ctx->WinSysDrawBuffer;
+ }
+
+ draw_buffer_no_error(ctx, fb, buf, "glNamedFramebufferDrawBuffer");
+}
+
+
+void GLAPIENTRY
+_mesa_FramebufferDrawBufferEXT(GLuint framebuffer, GLenum buf)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ struct gl_framebuffer *fb;
+
+ if (framebuffer) {
+ fb = _mesa_lookup_framebuffer_dsa(ctx, framebuffer,
+ "glFramebufferDrawBufferEXT");
+ if (!fb)
+ return;
+ }
+ else
+ fb = ctx->WinSysDrawBuffer;
+
+ draw_buffer_error(ctx, fb, buf, "glFramebufferDrawBufferEXT");
+}
+
+
+void GLAPIENTRY
+_mesa_NamedFramebufferDrawBuffer(GLuint framebuffer, GLenum buf)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ struct gl_framebuffer *fb;
+
+ if (framebuffer) {
+ fb = _mesa_lookup_framebuffer_err(ctx, framebuffer,
+ "glNamedFramebufferDrawBuffer");
+ if (!fb)
+ return;
+ }
+ else
+ fb = ctx->WinSysDrawBuffer;
+
+ draw_buffer_error(ctx, fb, buf, "glNamedFramebufferDrawBuffer");
}
/**
- * Called by glDrawBuffersARB; specifies the destination color renderbuffers
- * for N fragment program color outputs.
+ * Called by glDrawBuffersARB() and glNamedFramebufferDrawBuffers() to specify
+ * the destination color renderbuffers for N fragment program color outputs.
* \sa _mesa_DrawBuffer
* \param n number of outputs
* \param buffers array [n] of renderbuffer names. Unlike glDrawBuffer, the
* names cannot specify more than one buffer. For example,
- * GL_FRONT_AND_BACK is illegal.
+ * GL_FRONT_AND_BACK is illegal. The only exception is GL_BACK
+ * that is considered special and allowed as far as n is one
+ * since 4.5.
*/
-void GLAPIENTRY
-_mesa_DrawBuffersARB(GLsizei n, const GLenum *buffers)
+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)
{
- GLint output;
+ GLuint output;
GLbitfield usedBufferMask, supportedMask;
GLbitfield destMask[MAX_DRAW_BUFFERS];
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
- /* Turns out n==0 is a valid input that should not produce an error.
- * The remaining code below correctly handles the n==0 case.
- */
- if (n < 0 || n > (GLsizei) ctx->Const.MaxDrawBuffers) {
- _mesa_error(ctx, GL_INVALID_VALUE, "glDrawBuffersARB(n)");
- return;
+ FLUSH_VERTICES(ctx, 0);
+
+ 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;
+ }
+
+ /* 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, ctx->DrawBuffer);
+ supportedMask = supported_buffer_bitmask(ctx, fb);
usedBufferMask = 0x0;
/* complicated error checking... */
for (output = 0; output < n; output++) {
+ if (!no_error) {
+ /* 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."
+ *
+ * From the OpenGL 4.5 specification, 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 (buffers[output] == GL_BACK &&
+ _mesa_is_winsys_fbo(fb) &&
+ _mesa_is_desktop_gl(ctx) &&
+ ctx->Version >= 40) {
+ if (n != 1) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "%s(with GL_BACK n must be 1)",
+ caller);
+ return;
+ }
+ } else if (buffers[output] == GL_FRONT ||
+ buffers[output] == GL_LEFT ||
+ buffers[output] == GL_RIGHT ||
+ buffers[output] == GL_FRONT_AND_BACK ||
+ (buffers[output] == GL_BACK &&
+ _mesa_is_desktop_gl(ctx))) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "%s(invalid buffer %s)",
+ caller, _mesa_enum_to_string(buffers[output]));
+ return;
+ }
+ }
+
+ destMask[output] = draw_buffer_enum_to_bitmask(ctx, buffers[output]);
+
+ 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;
+ }
+ }
+
if (buffers[output] == GL_NONE) {
destMask[output] = 0x0;
}
else {
- destMask[output] = draw_buffer_enum_to_bitmask(buffers[output]);
- if (destMask[output] == BAD_MASK
- || _mesa_bitcount(destMask[output]) > 1) {
- _mesa_error(ctx, GL_INVALID_ENUM, "glDrawBuffersARB(buffer)");
- return;
- }
- destMask[output] &= supportedMask;
- if (destMask[output] == 0) {
+ /* Page 259 (page 275 of the PDF) in section 4.2.1 of the OpenGL 3.0
+ * spec (20080923) says:
+ *
+ * "If the GL is bound to a framebuffer object and DrawBuffers is
+ * supplied with [...] COLOR_ATTACHMENTm where m is greater than
+ * or equal to the value of MAX_COLOR_ATTACHMENTS, then the error
+ * INVALID_OPERATION results."
+ */
+ if (!no_error && _mesa_is_user_fbo(fb) && buffers[output] >=
+ GL_COLOR_ATTACHMENT0 + ctx->Const.MaxDrawBuffers) {
_mesa_error(ctx, GL_INVALID_OPERATION,
- "glDrawBuffersARB(unsupported buffer)");
+ "%s(buffers[%d] >= maximum number of draw buffers)",
+ caller, output);
return;
}
- if (destMask[output] & usedBufferMask) {
- /* can't specify a dest buffer more than once! */
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glDrawBuffersARB(duplicated buffer)");
- 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
+ * any of the color buffers allocated to the GL context by the window
+ * system, the error INVALID_OPERATION will be generated.
+ *
+ * If the GL is bound to a framebuffer object and DrawBuffers is
+ * supplied with a constant from table 4.6 [...] then the error
+ * INVALID_OPERATION results."
+ */
+ destMask[output] &= supportedMask;
+ 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;
+ }
+
+ /* 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 */
}
/* OK, if we get here, there were no errors so set the new state */
- _mesa_drawbuffers(ctx, n, buffers, destMask);
+ GLenum16 buffers16[MAX_DRAW_BUFFERS];
+ for (int i = 0; i < n; i++)
+ buffers16[i] = buffers[i];
+
+ _mesa_drawbuffers(ctx, fb, n, buffers16, destMask);
/*
- * Call device driver function. Note that n can be equal to 0,
+ * Call device driver function if fb is the bound draw buffer.
+ * Note that n can be equal to 0,
* in which case we don't want to reference buffers[0], which
* may not be valid.
*/
- if (ctx->Driver.DrawBuffers)
- ctx->Driver.DrawBuffers(ctx, n, buffers);
- else if (ctx->Driver.DrawBuffer)
- ctx->Driver.DrawBuffer(ctx, n > 0 ? buffers[0] : GL_NONE);
+ if (fb == ctx->DrawBuffer) {
+ if (ctx->Driver.DrawBuffer)
+ ctx->Driver.DrawBuffer(ctx);
+ if (ctx->Driver.DrawBufferAllocate)
+ ctx->Driver.DrawBufferAllocate(ctx);
+ }
+}
+
+
+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);
+}
+
+
+static void
+draw_buffers_no_error(struct gl_context *ctx, struct gl_framebuffer *fb,
+ GLsizei n, const GLenum *buffers, const char *caller)
+{
+ draw_buffers(ctx, fb, n, buffers, caller, true);
+}
+
+
+void GLAPIENTRY
+_mesa_DrawBuffers_no_error(GLsizei n, const GLenum *buffers)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ draw_buffers_no_error(ctx, ctx->DrawBuffer, n, buffers, "glDrawBuffers");
+}
+
+
+void GLAPIENTRY
+_mesa_DrawBuffers(GLsizei n, const GLenum *buffers)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ draw_buffers_error(ctx, ctx->DrawBuffer, n, buffers, "glDrawBuffers");
+}
+
+void GLAPIENTRY
+_mesa_FramebufferDrawBuffersEXT(GLuint framebuffer, GLsizei n,
+ const GLenum *bufs)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ struct gl_framebuffer *fb;
+
+ if (framebuffer) {
+ fb = _mesa_lookup_framebuffer_dsa(ctx, framebuffer,
+ "glFramebufferDrawBuffersEXT");
+ if (!fb)
+ return;
+ }
+ else
+ fb = ctx->WinSysDrawBuffer;
+
+ draw_buffers_error(ctx, fb, n, bufs, "glFramebufferDrawBuffersEXT");
+}
+
+void GLAPIENTRY
+_mesa_NamedFramebufferDrawBuffers_no_error(GLuint framebuffer, GLsizei n,
+ const GLenum *bufs)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ struct gl_framebuffer *fb;
+
+ if (framebuffer) {
+ fb = _mesa_lookup_framebuffer(ctx, framebuffer);
+ } else {
+ fb = ctx->WinSysDrawBuffer;
+ }
+
+ draw_buffers_no_error(ctx, fb, n, bufs, "glNamedFramebufferDrawBuffers");
+}
+
+
+void GLAPIENTRY
+_mesa_NamedFramebufferDrawBuffers(GLuint framebuffer, GLsizei n,
+ const GLenum *bufs)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ struct gl_framebuffer *fb;
+
+ if (framebuffer) {
+ fb = _mesa_lookup_framebuffer_err(ctx, framebuffer,
+ "glNamedFramebufferDrawBuffers");
+ if (!fb)
+ return;
+ }
+ else
+ fb = ctx->WinSysDrawBuffer;
+
+ draw_buffers_error(ctx, fb, n, bufs, "glNamedFramebufferDrawBuffers");
}
+
/**
* Performs necessary state updates when _mesa_drawbuffers makes an
* actual change.
*/
static void
-updated_drawbuffers(struct gl_context *ctx)
+updated_drawbuffers(struct gl_context *ctx, struct gl_framebuffer *fb)
{
FLUSH_VERTICES(ctx, _NEW_BUFFERS);
-#if FEATURE_GL
- if (ctx->API == API_OPENGL && !ctx->Extensions.ARB_ES2_compatibility) {
- struct gl_framebuffer *fb = ctx->DrawBuffer;
-
+ if (ctx->API == API_OPENGL_COMPAT && !ctx->Extensions.ARB_ES2_compatibility) {
/* Flag the FBO as requiring validation. */
- if (fb->Name != 0) {
+ if (_mesa_is_user_fbo(fb)) {
fb->_Status = 0;
}
}
-#endif
}
+
/**
- * Helper function to set the GL_DRAW_BUFFER state in the context and
- * current FBO. Called via glDrawBuffer(), glDrawBuffersARB()
+ * Helper function to set the GL_DRAW_BUFFER state for the given context and
+ * FBO. Called via glDrawBuffer(), glDrawBuffersARB()
*
* All error checking will have been done prior to calling this function
* so nothing should go wrong at this point.
*
* \param ctx current context
+ * \param fb the desired draw buffer
* \param n number of color outputs to set
* \param buffers array[n] of colorbuffer names, like GL_LEFT.
* \param destMask array[n] of BUFFER_BIT_* bitmasks which correspond to the
* BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT).
*/
void
-_mesa_drawbuffers(struct gl_context *ctx, GLuint n, const GLenum *buffers,
+_mesa_drawbuffers(struct gl_context *ctx, struct gl_framebuffer *fb,
+ GLuint n, const GLenum16 *buffers,
const GLbitfield *destMask)
{
- struct gl_framebuffer *fb = ctx->DrawBuffer;
GLbitfield mask[MAX_DRAW_BUFFERS];
+ GLuint buf;
if (!destMask) {
/* compute destMask values now */
const GLbitfield supportedMask = supported_buffer_bitmask(ctx, fb);
GLuint output;
for (output = 0; output < n; output++) {
- mask[output] = draw_buffer_enum_to_bitmask(buffers[output]);
- ASSERT(mask[output] != BAD_MASK);
+ mask[output] = draw_buffer_enum_to_bitmask(ctx, buffers[output]);
+ assert(mask[output] != BAD_MASK);
mask[output] &= supportedMask;
}
destMask = mask;
}
/*
- * If n==1, destMask[0] may have up to four bits set.
+ * destMask[0] may have up to four bits set
+ * (ex: glDrawBuffer(GL_FRONT_AND_BACK)).
* Otherwise, destMask[x] can only have one bit set.
*/
- if (n == 1) {
+ if (n > 0 && util_bitcount(destMask[0]) > 1) {
GLuint count = 0, destMask0 = destMask[0];
while (destMask0) {
- GLint bufIndex = _mesa_ffs(destMask0) - 1;
+ const gl_buffer_index bufIndex = u_bit_scan(&destMask0);
if (fb->_ColorDrawBufferIndexes[count] != bufIndex) {
- updated_drawbuffers(ctx);
+ updated_drawbuffers(ctx, fb);
fb->_ColorDrawBufferIndexes[count] = bufIndex;
}
count++;
- destMask0 &= ~(1 << bufIndex);
}
fb->ColorDrawBuffer[0] = buffers[0];
- if (fb->_NumColorDrawBuffers != count) {
- updated_drawbuffers(ctx);
- fb->_NumColorDrawBuffers = count;
- }
+ fb->_NumColorDrawBuffers = count;
}
else {
- GLuint buf, count = 0;
+ GLuint count = 0;
for (buf = 0; buf < n; buf++ ) {
if (destMask[buf]) {
- GLint bufIndex = _mesa_ffs(destMask[buf]) - 1;
+ gl_buffer_index bufIndex = ffs(destMask[buf]) - 1;
/* only one bit should be set in the destMask[buf] field */
- ASSERT(_mesa_bitcount(destMask[buf]) == 1);
+ assert(util_bitcount(destMask[buf]) == 1);
if (fb->_ColorDrawBufferIndexes[buf] != bufIndex) {
- updated_drawbuffers(ctx);
+ updated_drawbuffers(ctx, fb);
fb->_ColorDrawBufferIndexes[buf] = bufIndex;
}
count = buf + 1;
}
else {
- if (fb->_ColorDrawBufferIndexes[buf] != -1) {
- updated_drawbuffers(ctx);
- fb->_ColorDrawBufferIndexes[buf] = -1;
+ if (fb->_ColorDrawBufferIndexes[buf] != BUFFER_NONE) {
+ updated_drawbuffers(ctx, fb);
+ fb->_ColorDrawBufferIndexes[buf] = BUFFER_NONE;
}
}
fb->ColorDrawBuffer[buf] = buffers[buf];
}
- /* set remaining outputs to -1 (GL_NONE) */
- while (buf < ctx->Const.MaxDrawBuffers) {
- if (fb->_ColorDrawBufferIndexes[buf] != -1) {
- updated_drawbuffers(ctx);
- fb->_ColorDrawBufferIndexes[buf] = -1;
- }
- fb->ColorDrawBuffer[buf] = GL_NONE;
- buf++;
- }
fb->_NumColorDrawBuffers = count;
}
- if (fb->Name == 0) {
+ /* set remaining outputs to BUFFER_NONE */
+ for (buf = fb->_NumColorDrawBuffers; buf < ctx->Const.MaxDrawBuffers; buf++) {
+ if (fb->_ColorDrawBufferIndexes[buf] != BUFFER_NONE) {
+ updated_drawbuffers(ctx, fb);
+ fb->_ColorDrawBufferIndexes[buf] = BUFFER_NONE;
+ }
+ }
+ for (buf = n; buf < ctx->Const.MaxDrawBuffers; buf++) {
+ fb->ColorDrawBuffer[buf] = GL_NONE;
+ }
+
+ if (_mesa_is_winsys_fbo(fb)) {
/* also set context drawbuffer state */
- GLuint buf;
for (buf = 0; buf < ctx->Const.MaxDrawBuffers; buf++) {
if (ctx->Color.DrawBuffer[buf] != fb->ColorDrawBuffer[buf]) {
- updated_drawbuffers(ctx);
+ updated_drawbuffers(ctx, fb);
ctx->Color.DrawBuffer[buf] = fb->ColorDrawBuffer[buf];
}
}
void
_mesa_update_draw_buffers(struct gl_context *ctx)
{
- GLenum buffers[MAX_DRAW_BUFFERS];
- GLuint i;
-
/* should be a window system FBO */
- assert(ctx->DrawBuffer->Name == 0);
-
- for (i = 0; i < ctx->Const.MaxDrawBuffers; i++)
- buffers[i] = ctx->Color.DrawBuffer[i];
+ assert(_mesa_is_winsys_fbo(ctx->DrawBuffer));
- _mesa_drawbuffers(ctx, ctx->Const.MaxDrawBuffers, buffers, NULL);
+ _mesa_drawbuffers(ctx, ctx->DrawBuffer, ctx->Const.MaxDrawBuffers,
+ ctx->Color.DrawBuffer, NULL);
}
/**
* Like \sa _mesa_drawbuffers(), this is a helper function for setting
- * GL_READ_BUFFER state in the context and current FBO.
+ * GL_READ_BUFFER state for the given context and FBO.
+ * Note that all error checking should have been done before calling
+ * this function.
* \param ctx the rendering context
+ * \param fb the framebuffer object to update
* \param buffer GL_FRONT, GL_BACK, GL_COLOR_ATTACHMENT0, etc.
* \param bufferIndex the numerical index corresponding to 'buffer'
*/
void
-_mesa_readbuffer(struct gl_context *ctx, GLenum buffer, GLint bufferIndex)
+_mesa_readbuffer(struct gl_context *ctx, struct gl_framebuffer *fb,
+ GLenum buffer, gl_buffer_index bufferIndex)
{
- struct gl_framebuffer *fb = ctx->ReadBuffer;
-
- if (fb->Name == 0) {
+ if ((fb == ctx->ReadBuffer) && _mesa_is_winsys_fbo(fb)) {
/* Only update the per-context READ_BUFFER state if we're bound to
* a window-system framebuffer.
*/
/**
- * Called by glReadBuffer to set the source renderbuffer for reading pixels.
+ * Called by glReadBuffer and glNamedFramebufferReadBuffer to set the source
+ * renderbuffer for reading pixels.
* \param mode color buffer such as GL_FRONT, GL_BACK, etc.
*/
-void GLAPIENTRY
-_mesa_ReadBuffer(GLenum buffer)
+static ALWAYS_INLINE void
+read_buffer(struct gl_context *ctx, struct gl_framebuffer *fb,
+ GLenum buffer, const char *caller, bool no_error)
{
- struct gl_framebuffer *fb;
- GLbitfield supportedMask;
- GLint srcBuffer;
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
-
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
+ gl_buffer_index srcBuffer;
- fb = ctx->ReadBuffer;
+ FLUSH_VERTICES(ctx, 0);
if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
+ _mesa_debug(ctx, "%s %s\n", caller, _mesa_enum_to_string(buffer));
- if (fb->Name > 0 && buffer == GL_NONE) {
- /* This is legal for user-created framebuffer objects */
- srcBuffer = -1;
+ if (buffer == GL_NONE) {
+ /* This is legal--it means that no buffer should be bound for reading. */
+ srcBuffer = BUFFER_NONE;
}
else {
/* general case / window-system framebuffer */
- srcBuffer = read_buffer_enum_to_index(buffer);
- if (srcBuffer == -1) {
- _mesa_error(ctx, GL_INVALID_ENUM,
- "glReadBuffer(buffer=0x%x)", buffer);
- return;
- }
- supportedMask = supported_buffer_bitmask(ctx, fb);
- if (((1 << srcBuffer) & supportedMask) == 0) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glReadBuffer(buffer=0x%x)", buffer);
- return;
+ if (!no_error &&_mesa_is_gles3(ctx) &&
+ !is_legal_es3_readbuffer_enum(buffer))
+ srcBuffer = BUFFER_NONE;
+ else
+ srcBuffer = read_buffer_enum_to_index(ctx, buffer);
+
+ if (!no_error) {
+ GLbitfield supportedMask;
+
+ if (srcBuffer == BUFFER_NONE) {
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "%s(invalid buffer %s)", caller,
+ _mesa_enum_to_string(buffer));
+ return;
+ }
+
+ supportedMask = supported_buffer_bitmask(ctx, fb);
+ if (((1 << srcBuffer) & supportedMask) == 0) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "%s(invalid buffer %s)", caller,
+ _mesa_enum_to_string(buffer));
+ return;
+ }
}
}
/* OK, all error checking has been completed now */
- _mesa_readbuffer(ctx, buffer, srcBuffer);
- ctx->NewState |= _NEW_BUFFERS;
+ _mesa_readbuffer(ctx, fb, buffer, srcBuffer);
- /*
- * Call device driver function.
- */
- if (ctx->Driver.ReadBuffer)
- (*ctx->Driver.ReadBuffer)(ctx, buffer);
+ /* Call the device driver function only if fb is the bound read buffer */
+ if (fb == ctx->ReadBuffer) {
+ if (ctx->Driver.ReadBuffer)
+ ctx->Driver.ReadBuffer(ctx, buffer);
+ }
+}
+
+
+static void
+read_buffer_err(struct gl_context *ctx, struct gl_framebuffer *fb,
+ GLenum buffer, const char *caller)
+{
+ read_buffer(ctx, fb, buffer, caller, false);
+}
+
+
+static void
+read_buffer_no_error(struct gl_context *ctx, struct gl_framebuffer *fb,
+ GLenum buffer, const char *caller)
+{
+ read_buffer(ctx, fb, buffer, caller, true);
+}
+
+
+void GLAPIENTRY
+_mesa_ReadBuffer_no_error(GLenum buffer)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ read_buffer_no_error(ctx, ctx->ReadBuffer, buffer, "glReadBuffer");
+}
+
+
+void GLAPIENTRY
+_mesa_ReadBuffer(GLenum buffer)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ read_buffer_err(ctx, ctx->ReadBuffer, buffer, "glReadBuffer");
+}
+
+
+void GLAPIENTRY
+_mesa_NamedFramebufferReadBuffer_no_error(GLuint framebuffer, GLenum src)
+{
+ GET_CURRENT_CONTEXT(ctx);
+
+ struct gl_framebuffer *fb;
+
+ if (framebuffer) {
+ fb = _mesa_lookup_framebuffer(ctx, framebuffer);
+ } else {
+ fb = ctx->WinSysReadBuffer;
+ }
+
+ read_buffer_no_error(ctx, fb, src, "glNamedFramebufferReadBuffer");
+}
+
+
+void GLAPIENTRY
+_mesa_FramebufferReadBufferEXT(GLuint framebuffer, GLenum buf)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ struct gl_framebuffer *fb;
+
+ if (framebuffer) {
+ fb = _mesa_lookup_framebuffer_dsa(ctx, framebuffer,
+ "glFramebufferReadBufferEXT");
+ if (!fb)
+ return;
+ }
+ else
+ fb = ctx->WinSysDrawBuffer;
+
+ read_buffer_err(ctx, fb, buf, "glFramebufferReadBufferEXT");
+}
+
+
+void GLAPIENTRY
+_mesa_NamedFramebufferReadBuffer(GLuint framebuffer, GLenum src)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ struct gl_framebuffer *fb;
+
+ if (framebuffer) {
+ fb = _mesa_lookup_framebuffer_err(ctx, framebuffer,
+ "glNamedFramebufferReadBuffer");
+ if (!fb)
+ return;
+ }
+ else
+ fb = ctx->WinSysReadBuffer;
+
+ read_buffer_err(ctx, fb, src, "glNamedFramebufferReadBuffer");
}
projects / mesa.git / blobdiff