#include "colormac.h"
#include "context.h"
#include "enums.h"
-#include "fbobject.h"
-#include "state.h"
+#include "mtypes.h"
#define BAD_MASK ~0u
* \return bitmask of BUFFER_BIT_* flags
*/
static GLbitfield
-supported_buffer_bitmask(const GLcontext *ctx, const struct gl_framebuffer *fb)
+supported_buffer_bitmask(const struct gl_context *ctx, const struct gl_framebuffer *fb)
{
GLbitfield mask = 0x0;
case GL_AUX0:
return BUFFER_BIT_AUX0;
case GL_AUX1:
- return BUFFER_BIT_AUX1;
case GL_AUX2:
- return BUFFER_BIT_AUX2;
case GL_AUX3:
- return BUFFER_BIT_AUX3;
+ return 1 << BUFFER_COUNT; /* invalid, but not BAD_MASK */
case GL_COLOR_ATTACHMENT0_EXT:
return BUFFER_BIT_COLOR0;
case GL_COLOR_ATTACHMENT1_EXT:
return BUFFER_BIT_COLOR2;
case GL_COLOR_ATTACHMENT3_EXT:
return BUFFER_BIT_COLOR3;
+ case GL_COLOR_ATTACHMENT4_EXT:
+ return BUFFER_BIT_COLOR4;
+ case GL_COLOR_ATTACHMENT5_EXT:
+ return BUFFER_BIT_COLOR5;
+ case GL_COLOR_ATTACHMENT6_EXT:
+ return BUFFER_BIT_COLOR6;
+ case GL_COLOR_ATTACHMENT7_EXT:
+ return BUFFER_BIT_COLOR7;
default:
/* error */
return BAD_MASK;
case GL_AUX0:
return BUFFER_AUX0;
case GL_AUX1:
- return BUFFER_AUX1;
case GL_AUX2:
- return BUFFER_AUX2;
case GL_AUX3:
- return BUFFER_AUX3;
+ return BUFFER_COUNT; /* invalid, but not -1 */
case GL_COLOR_ATTACHMENT0_EXT:
return BUFFER_COLOR0;
case GL_COLOR_ATTACHMENT1_EXT:
return BUFFER_COLOR2;
case GL_COLOR_ATTACHMENT3_EXT:
return BUFFER_COLOR3;
+ case GL_COLOR_ATTACHMENT4_EXT:
+ return BUFFER_COLOR4;
+ case GL_COLOR_ATTACHMENT5_EXT:
+ return BUFFER_COLOR5;
+ case GL_COLOR_ATTACHMENT6_EXT:
+ return BUFFER_COLOR6;
+ case GL_COLOR_ATTACHMENT7_EXT:
+ return BUFFER_COLOR7;
default:
/* error */
return -1;
* \sa _mesa_DrawBuffersARB
*
* \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).
+ * 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.
+ *
+ * Furthermore, upon a MakeCurrent() or BindFramebuffer() call, if the
+ * new FB is a window system FB, we need to re-update the FB's
+ * ColorDrawBuffer state to match the context. This is handled in
+ * _mesa_update_framebuffer().
+ *
+ * See the GL_EXT_framebuffer_object spec for more info.
*/
void GLAPIENTRY
_mesa_DrawBuffer(GLenum buffer)
destMask = draw_buffer_enum_to_bitmask(buffer);
if (destMask == BAD_MASK) {
/* totally bogus buffer */
- _mesa_error(ctx, GL_INVALID_ENUM, "glDrawBuffer(buffer)");
+ _mesa_error(ctx, GL_INVALID_ENUM, "glDrawBuffer(buffer=0x%x)", buffer);
return;
}
destMask &= supportedMask;
if (destMask == 0x0) {
/* none of the named color buffers exist! */
- _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(buffer)");
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glDrawBuffer(buffer=0x%x)", buffer);
return;
}
}
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
- if (!ctx->Extensions.ARB_draw_buffers) {
- _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffersARB");
- return;
- }
- if (n < 1 || n > (GLsizei) ctx->Const.MaxDrawBuffers) {
+ /* 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;
}
_mesa_drawbuffers(ctx, n, buffers, destMask);
/*
- * Call device driver function.
+ * Call device driver function. 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, buffers[0]);
-}
-
-
-/**
- * Set color output state. Traditionally, there was only one color
- * output, but fragment programs can now have several distinct color
- * outputs (see GL_ARB_draw_buffers). This function sets the state
- * for one such color output.
- * \param ctx current context
- * \param output which fragment program output
- * \param buffer buffer to write to (like GL_LEFT)
- * \param destMask BUFFER_* bitmask
- * (like BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT).
- */
-static void
-set_color_output(GLcontext *ctx, GLuint output, GLenum buffer,
- GLbitfield destMask)
-{
- struct gl_framebuffer *fb = ctx->DrawBuffer;
-
- ASSERT(output < ctx->Const.MaxDrawBuffers);
-
- /* Set per-FBO state */
- fb->ColorDrawBuffer[output] = buffer;
- fb->_ColorDrawBufferMask[output] = destMask;
- /* not really needed, will be set later */
- fb->_NumColorDrawBuffers[output] = 0;
-
- if (fb->Name == 0)
- /* Set traditional state var */
- ctx->Color.DrawBuffer[output] = buffer;
+ ctx->Driver.DrawBuffer(ctx, n > 0 ? buffers[0] : GL_NONE);
}
/**
- * Helper routine used by _mesa_DrawBuffer, _mesa_DrawBuffersARB and
- * other places (window fbo fixup) to set fbo (and the old ctx) fields.
+ * Helper function to set the GL_DRAW_BUFFER state in the context and
+ * current 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 n number of color outputs to set
* \param buffers array[n] of colorbuffer names, like GL_LEFT.
- * \param destMask array[n] of BUFFER_* bitmasks which correspond to the
+ * \param destMask array[n] of BUFFER_BIT_* bitmasks which correspond to the
* colorbuffer names. (i.e. GL_FRONT_AND_BACK =>
* BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT).
*/
void
-_mesa_drawbuffers(GLcontext *ctx, GLuint n, const GLenum *buffers,
+_mesa_drawbuffers(struct gl_context *ctx, GLuint n, const GLenum *buffers,
const GLbitfield *destMask)
{
+ struct gl_framebuffer *fb = ctx->DrawBuffer;
GLbitfield mask[MAX_DRAW_BUFFERS];
- GLuint output;
+ GLboolean newState = GL_FALSE;
if (!destMask) {
/* compute destMask values now */
- const GLbitfield supportedMask
- = supported_buffer_bitmask(ctx, ctx->DrawBuffer);
+ 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);
destMask = mask;
}
- for (output = 0; output < n; output++) {
- set_color_output(ctx, output, buffers[output], destMask[output]);
+ /*
+ * If n==1, destMask[0] may have up to four bits set.
+ * Otherwise, destMask[x] can only have one bit set.
+ */
+ if (n == 1) {
+ GLuint count = 0, destMask0 = destMask[0];
+ while (destMask0) {
+ GLint bufIndex = _mesa_ffs(destMask0) - 1;
+ if (fb->_ColorDrawBufferIndexes[count] != bufIndex) {
+ fb->_ColorDrawBufferIndexes[count] = bufIndex;
+ newState = GL_TRUE;
+ }
+ count++;
+ destMask0 &= ~(1 << bufIndex);
+ }
+ fb->ColorDrawBuffer[0] = buffers[0];
+ if (fb->_NumColorDrawBuffers != count) {
+ fb->_NumColorDrawBuffers = count;
+ newState = GL_TRUE;
+ }
+ }
+ else {
+ GLuint buf, count = 0;
+ for (buf = 0; buf < n; buf++ ) {
+ if (destMask[buf]) {
+ GLint bufIndex = _mesa_ffs(destMask[buf]) - 1;
+ /* only one bit should be set in the destMask[buf] field */
+ ASSERT(_mesa_bitcount(destMask[buf]) == 1);
+ if (fb->_ColorDrawBufferIndexes[buf] != bufIndex) {
+ fb->_ColorDrawBufferIndexes[buf] = bufIndex;
+ newState = GL_TRUE;
+ }
+ fb->ColorDrawBuffer[buf] = buffers[buf];
+ count = buf + 1;
+ }
+ else {
+ if (fb->_ColorDrawBufferIndexes[buf] != -1) {
+ fb->_ColorDrawBufferIndexes[buf] = -1;
+ newState = GL_TRUE;
+ }
+ }
+ }
+ /* set remaining outputs to -1 (GL_NONE) */
+ while (buf < ctx->Const.MaxDrawBuffers) {
+ if (fb->_ColorDrawBufferIndexes[buf] != -1) {
+ fb->_ColorDrawBufferIndexes[buf] = -1;
+ newState = GL_TRUE;
+ }
+ fb->ColorDrawBuffer[buf] = GL_NONE;
+ buf++;
+ }
+ fb->_NumColorDrawBuffers = count;
}
- /* set remaining color outputs to NONE */
- for (output = n; output < ctx->Const.MaxDrawBuffers; output++) {
- set_color_output(ctx, output, GL_NONE, 0x0);
+ if (fb->Name == 0) {
+ /* also set context drawbuffer state */
+ GLuint buf;
+ for (buf = 0; buf < ctx->Const.MaxDrawBuffers; buf++) {
+ if (ctx->Color.DrawBuffer[buf] != fb->ColorDrawBuffer[buf]) {
+ ctx->Color.DrawBuffer[buf] = fb->ColorDrawBuffer[buf];
+ newState = GL_TRUE;
+ }
+ }
+ }
+
+ if (newState)
+ FLUSH_VERTICES(ctx, _NEW_BUFFERS);
+}
+
+
+/**
+ * Like \sa _mesa_drawbuffers(), this is a helper function for setting
+ * GL_READ_BUFFER state in the context and current FBO.
+ * \param ctx the rendering context
+ * \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)
+{
+ struct gl_framebuffer *fb = ctx->ReadBuffer;
+
+ if (fb->Name == 0) {
+ /* Only update the per-context READ_BUFFER state if we're bound to
+ * a window-system framebuffer.
+ */
+ ctx->Pixel.ReadBuffer = buffer;
}
+ fb->ColorReadBuffer = buffer;
+ fb->_ColorReadBufferIndex = bufferIndex;
+
ctx->NewState |= _NEW_BUFFERS;
}
-GLboolean
-_mesa_readbuffer_update_fields(GLcontext *ctx, GLenum buffer)
+
+/**
+ * Called by glReadBuffer 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)
{
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));
fb = ctx->ReadBuffer;
/* 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 GL_FALSE;
+ _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 GL_FALSE;
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glReadBuffer(buffer=0x%x)", buffer);
+ return;
}
}
- if (fb->Name == 0) {
- ctx->Pixel.ReadBuffer = buffer;
- }
- fb->ColorReadBuffer = buffer;
- fb->_ColorReadBufferIndex = srcBuffer;
-
- return GL_TRUE;
-}
-
-
-
-/**
- * Called by glReadBuffer 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)
-{
- 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));
-
- if (!_mesa_readbuffer_update_fields(ctx, buffer))
- return;
+ /* OK, all error checking has been completed now */
+ _mesa_readbuffer(ctx, buffer, srcBuffer);
ctx->NewState |= _NEW_BUFFERS;
/*
if (ctx->Driver.ReadBuffer)
(*ctx->Driver.ReadBuffer)(ctx, buffer);
}
-
-
-
-/*
- * XXX move somewhere else someday?
- */
-void GLAPIENTRY
-_mesa_SampleCoverageARB(GLclampf value, GLboolean invert)
-{
- GET_CURRENT_CONTEXT(ctx);
-
- if (!ctx->Extensions.ARB_multisample) {
- _mesa_error(ctx, GL_INVALID_OPERATION, "glSampleCoverageARB");
- return;
- }
-
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx );
- ctx->Multisample.SampleCoverageValue = (GLfloat) CLAMP(value, 0.0, 1.0);
- ctx->Multisample.SampleCoverageInvert = invert;
- ctx->NewState |= _NEW_MULTISAMPLE;
-}
-
-
-
-/**
- * Initialize the context's multisample state.
- * \param ctx the GL context.
- */
-void
-_mesa_init_multisample(GLcontext *ctx)
-{
- ctx->Multisample.Enabled = GL_FALSE;
- ctx->Multisample.SampleAlphaToCoverage = GL_FALSE;
- ctx->Multisample.SampleAlphaToOne = GL_FALSE;
- ctx->Multisample.SampleCoverage = GL_FALSE;
- ctx->Multisample.SampleCoverageValue = 1.0;
- ctx->Multisample.SampleCoverageInvert = GL_FALSE;
-}
projects / mesa.git / blobdiff