/**
* \file buffers.c
- * General framebuffer-related functions, like glClear, glScissor, etc.
+ * glReadBuffer, DrawBuffer functions.
*/
#include "fbobject.h"
#include "state.h"
-#include "state_tracker/st_draw.h"
-
#define BAD_MASK ~0u
-#if _HAVE_FULL_GL
-void GLAPIENTRY
-_mesa_ClearIndex( GLfloat c )
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (ctx->Color.ClearIndex == (GLuint) c)
- return;
-
- FLUSH_VERTICES(ctx, _NEW_COLOR);
- ctx->Color.ClearIndex = (GLuint) c;
-
- if (!ctx->Visual.rgbMode && ctx->Driver.ClearIndex) {
- /* it's OK to call glClearIndex in RGBA mode but it should be a NOP */
- (*ctx->Driver.ClearIndex)( ctx, ctx->Color.ClearIndex );
- }
-}
-#endif
-
-
-/**
- * Specify the clear values for the color buffers.
- *
- * \param red red color component.
- * \param green green color component.
- * \param blue blue color component.
- * \param alpha alpha component.
- *
- * \sa glClearColor().
- *
- * Clamps the parameters and updates gl_colorbuffer_attrib::ClearColor. On a
- * change, flushes the vertices and notifies the driver via the
- * dd_function_table::ClearColor callback.
- */
-void GLAPIENTRY
-_mesa_ClearColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
-{
- GLfloat tmp[4];
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- tmp[0] = CLAMP(red, 0.0F, 1.0F);
- tmp[1] = CLAMP(green, 0.0F, 1.0F);
- tmp[2] = CLAMP(blue, 0.0F, 1.0F);
- tmp[3] = CLAMP(alpha, 0.0F, 1.0F);
-
- if (TEST_EQ_4V(tmp, ctx->Color.ClearColor))
- return; /* no change */
-
- FLUSH_VERTICES(ctx, _NEW_COLOR);
- COPY_4V(ctx->Color.ClearColor, tmp);
-
- if (ctx->Visual.rgbMode && ctx->Driver.ClearColor) {
- /* it's OK to call glClearColor in CI mode but it should be a NOP */
- (*ctx->Driver.ClearColor)(ctx, ctx->Color.ClearColor);
- }
-}
-
-
-/**
- * Clear buffers.
- *
- * \param mask bit-mask indicating the buffers to be cleared.
- *
- * Flushes the vertices and verifies the parameter. If __GLcontextRec::NewState
- * is set then calls _mesa_update_state() to update gl_frame_buffer::_Xmin,
- * etc. If the rasterization mode is set to GL_RENDER then requests the driver
- * to clear the buffers, via the dd_function_table::Clear callback.
- */
-void GLAPIENTRY
-_mesa_Clear( GLbitfield mask )
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
-
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glClear 0x%x\n", mask);
-
- if (mask & ~(GL_COLOR_BUFFER_BIT |
- GL_DEPTH_BUFFER_BIT |
- GL_STENCIL_BUFFER_BIT |
- GL_ACCUM_BUFFER_BIT)) {
- /* invalid bit set */
- _mesa_error( ctx, GL_INVALID_VALUE, "glClear(0x%x)", mask);
- return;
- }
-
- if (ctx->NewState) {
- _mesa_update_state( ctx ); /* update _Xmin, etc */
- }
-
- if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
- _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
- "glClear(incomplete framebuffer)");
- return;
- }
-
- if (ctx->DrawBuffer->Width == 0 || ctx->DrawBuffer->Height == 0)
- return;
-
- if (ctx->RenderMode == GL_RENDER) {
- GLbitfield bufferMask;
-
- /* don't clear depth buffer if depth writing disabled */
- if (!ctx->Depth.Mask)
- mask &= ~GL_DEPTH_BUFFER_BIT;
-
- /* Build the bitmask to send to device driver's Clear function.
- * Note that the GL_COLOR_BUFFER_BIT flag will expand to 0, 1, 2 or 4
- * of the BUFFER_BIT_FRONT/BACK_LEFT/RIGHT flags, or one of the
- * BUFFER_BIT_COLORn flags.
- */
- bufferMask = 0;
- if (mask & GL_COLOR_BUFFER_BIT) {
- bufferMask |= ctx->DrawBuffer->_ColorDrawBufferMask[0];
- }
-
- if ((mask & GL_DEPTH_BUFFER_BIT)
- && ctx->DrawBuffer->Visual.haveDepthBuffer) {
- bufferMask |= BUFFER_BIT_DEPTH;
- }
-
- if ((mask & GL_STENCIL_BUFFER_BIT)
- && ctx->DrawBuffer->Visual.haveStencilBuffer) {
- bufferMask |= BUFFER_BIT_STENCIL;
- }
-
- if ((mask & GL_ACCUM_BUFFER_BIT)
- && ctx->DrawBuffer->Visual.haveAccumBuffer) {
- bufferMask |= BUFFER_BIT_ACCUM;
- }
-
- ASSERT(ctx->Driver.Clear);
- ctx->Driver.Clear(ctx, bufferMask);
- }
-}
-
-
-
/**
* Return bitmask of BUFFER_BIT_* flags indicating which color buffers are
* available to the rendering context (for drawing or reading).
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;
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)
/**
- * 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;
-}
-
-
-/**
- * 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.
+ *
* 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).
*/
_mesa_drawbuffers(GLcontext *ctx, GLuint n, const GLenum *buffers,
const GLbitfield *destMask)
{
+ struct gl_framebuffer *fb = ctx->DrawBuffer;
GLbitfield mask[MAX_DRAW_BUFFERS];
- GLuint output;
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) {
+ GLuint buf, count = 0;
+ /* init to -1 to help catch errors */
+ fb->_ColorDrawBufferIndexes[0] = -1;
+ for (buf = 0; buf < BUFFER_COUNT; buf++) {
+ if (destMask[0] & (1 << buf)) {
+ fb->_ColorDrawBufferIndexes[count] = buf;
+ count++;
+ }
+ }
+ fb->ColorDrawBuffer[0] = buffers[0];
+ fb->_NumColorDrawBuffers = count;
+ }
+ else {
+ GLuint buf, count = 0;
+ for (buf = 0; buf < n; buf++ ) {
+ if (destMask[buf]) {
+ fb->_ColorDrawBufferIndexes[buf] = _mesa_ffs(destMask[buf]) - 1;
+ fb->ColorDrawBuffer[buf] = buffers[buf];
+ count = buf + 1;
+ }
+ else {
+ fb->_ColorDrawBufferIndexes[buf] = -1;
+ }
+ }
+ /* set remaining outputs to -1 (GL_NONE) */
+ while (buf < ctx->Const.MaxDrawBuffers) {
+ fb->_ColorDrawBufferIndexes[buf] = -1;
+ 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++) {
+ ctx->Color.DrawBuffer[buf] = fb->ColorDrawBuffer[buf];
+ }
}
- ctx->NewState |= _NEW_COLOR;
+ ctx->NewState |= _NEW_BUFFERS;
}
-GLboolean
-_mesa_readbuffer_update_fields(GLcontext *ctx, GLenum buffer)
+/**
+ * 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(GLcontext *ctx, GLenum buffer, GLint bufferIndex)
{
- struct gl_framebuffer *fb;
- GLbitfield supportedMask;
- GLint srcBuffer;
-
- fb = ctx->ReadBuffer;
-
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
-
- if (fb->Name > 0 && buffer == GL_NONE) {
- /* This is legal for user-created framebuffer objects */
- srcBuffer = -1;
- }
- 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 GL_FALSE;
- }
- 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;
- }
- }
+ 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 = srcBuffer;
+ fb->_ColorReadBufferIndex = bufferIndex;
- return GL_TRUE;
+ ctx->NewState |= _NEW_PIXEL;
}
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));
- if (!_mesa_readbuffer_update_fields(ctx, buffer))
- return;
-
- ctx->NewState |= _NEW_PIXEL;
-
- /*
- * Call device driver function.
- */
- if (ctx->Driver.ReadBuffer)
- (*ctx->Driver.ReadBuffer)(ctx, buffer);
-}
-
-
-#if _HAVE_FULL_GL
-
-/**
- * XXX THIS IS OBSOLETE - drivers should take care of detecting window
- * size changes and act accordingly, likely calling _mesa_resize_framebuffer().
- *
- * GL_MESA_resize_buffers extension.
- *
- * When this function is called, we'll ask the window system how large
- * the current window is. If it's a new size, we'll call the driver's
- * ResizeBuffers function. The driver will then resize its color buffers
- * as needed, and maybe call the swrast's routine for reallocating
- * swrast-managed depth/stencil/accum/etc buffers.
- * \note This function should only be called through the GL API, not
- * from device drivers (as was done in the past).
- */
-
-void _mesa_resizebuffers( GLcontext *ctx )
-{
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx );
+ fb = ctx->ReadBuffer;
if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glResizeBuffersMESA\n");
+ _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
- if (!ctx->Driver.GetBufferSize) {
- return;
+ if (fb->Name > 0 && buffer == GL_NONE) {
+ /* This is legal for user-created framebuffer objects */
+ srcBuffer = -1;
}
-
- if (ctx->WinSysDrawBuffer) {
- GLuint newWidth, newHeight;
- GLframebuffer *buffer = ctx->WinSysDrawBuffer;
-
- assert(buffer->Name == 0);
-
- /* ask device driver for size of output buffer */
- ctx->Driver.GetBufferSize( buffer, &newWidth, &newHeight );
-
- /* see if size of device driver's color buffer (window) has changed */
- if (buffer->Width != newWidth || buffer->Height != newHeight) {
- if (ctx->Driver.ResizeBuffers)
- ctx->Driver.ResizeBuffers(ctx, buffer, newWidth, newHeight );
+ 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;
}
- }
-
- if (ctx->WinSysReadBuffer
- && ctx->WinSysReadBuffer != ctx->WinSysDrawBuffer) {
- GLuint newWidth, newHeight;
- GLframebuffer *buffer = ctx->WinSysReadBuffer;
-
- assert(buffer->Name == 0);
-
- /* ask device driver for size of read buffer */
- ctx->Driver.GetBufferSize( buffer, &newWidth, &newHeight );
-
- /* see if size of device driver's color buffer (window) has changed */
- if (buffer->Width != newWidth || buffer->Height != newHeight) {
- if (ctx->Driver.ResizeBuffers)
- ctx->Driver.ResizeBuffers(ctx, buffer, newWidth, newHeight );
+ supportedMask = supported_buffer_bitmask(ctx, fb);
+ if (((1 << srcBuffer) & supportedMask) == 0) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glReadBuffer(buffer=0x%x)", buffer);
+ return;
}
}
- ctx->NewState |= _NEW_BUFFERS; /* to update scissor / window bounds */
-}
-
-
-/*
- * XXX THIS IS OBSOLETE
- */
-void GLAPIENTRY
-_mesa_ResizeBuffersMESA( void )
-{
- GET_CURRENT_CONTEXT(ctx);
-
- if (ctx->Extensions.MESA_resize_buffers)
- _mesa_resizebuffers( ctx );
-}
-
-
-/*
- * 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;
-}
-
-#endif /* _HAVE_FULL_GL */
-
-
-
-/**
- * Define the scissor box.
- *
- * \param x, y coordinates of the scissor box lower-left corner.
- * \param width width of the scissor box.
- * \param height height of the scissor box.
- *
- * \sa glScissor().
- *
- * Verifies the parameters and updates __GLcontextRec::Scissor. On a
- * change flushes the vertices and notifies the driver via
- * the dd_function_table::Scissor callback.
- */
-void
-_mesa_set_scissor(GLcontext *ctx,
- GLint x, GLint y, GLsizei width, GLsizei height)
-{
- if (x == ctx->Scissor.X &&
- y == ctx->Scissor.Y &&
- width == ctx->Scissor.Width &&
- height == ctx->Scissor.Height)
- return;
-
- FLUSH_VERTICES(ctx, _NEW_SCISSOR);
- ctx->Scissor.X = x;
- ctx->Scissor.Y = y;
- ctx->Scissor.Width = width;
- ctx->Scissor.Height = height;
-
- if (ctx->Driver.Scissor)
- ctx->Driver.Scissor( ctx, x, y, width, height );
-}
-
-
-void GLAPIENTRY
-_mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height )
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (width < 0 || height < 0) {
- _mesa_error( ctx, GL_INVALID_VALUE, "glScissor" );
- return;
- }
-
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glScissor %d %d %d %d\n", x, y, width, height);
+ /* OK, all error checking has been completed now */
- _mesa_set_scissor(ctx, x, y, width, height);
-}
-
-
-
-/**********************************************************************/
-/** \name Initialization */
-/*@{*/
+ _mesa_readbuffer(ctx, buffer, srcBuffer);
+ ctx->NewState |= _NEW_BUFFERS;
-/**
- * Initialize the context's scissor state.
- * \param ctx the GL context.
- */
-void
-_mesa_init_scissor(GLcontext *ctx)
-{
- /* Scissor group */
- ctx->Scissor.Enabled = GL_FALSE;
- ctx->Scissor.X = 0;
- ctx->Scissor.Y = 0;
- ctx->Scissor.Width = 0;
- ctx->Scissor.Height = 0;
-}
-
-
-/**
- * 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;
+ /*
+ * Call device driver function.
+ */
+ if (ctx->Driver.ReadBuffer)
+ (*ctx->Driver.ReadBuffer)(ctx, buffer);
}
-
-/*@}*/
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