diff options
Diffstat (limited to 'mesalib/src/mesa/main/clear.c')
| -rw-r--r-- | mesalib/src/mesa/main/clear.c | 1070 |
1 files changed, 566 insertions, 504 deletions
diff --git a/mesalib/src/mesa/main/clear.c b/mesalib/src/mesa/main/clear.c index 49d86b3b1..3edcbe884 100644 --- a/mesalib/src/mesa/main/clear.c +++ b/mesalib/src/mesa/main/clear.c @@ -1,504 +1,566 @@ -/* - * Mesa 3-D graphics library - * Version: 7.1 - * - * Copyright (C) 1999-2007 Brian Paul All Rights Reserved. - * - * Permission is hereby granted, free of charge, to any person obtaining a - * copy of this software and associated documentation files (the "Software"), - * to deal in the Software without restriction, including without limitation - * the rights to use, copy, modify, merge, publish, distribute, sublicense, - * and/or sell copies of the Software, and to permit persons to whom the - * Software is furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included - * in all copies or substantial portions of the Software. - * - * 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. - */ - - -/** - * \file clear.c - * glClearColor, glClearIndex, glClear() functions. - */ - - - -#include "glheader.h" -#include "clear.h" -#include "context.h" -#include "colormac.h" -#include "enums.h" -#include "macros.h" -#include "state.h" - - - -#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; -} -#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->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); - - FLUSH_CURRENT(ctx, 0); - - 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 || - ctx->DrawBuffer->_Xmin >= ctx->DrawBuffer->_Xmax || - ctx->DrawBuffer->_Ymin >= ctx->DrawBuffer->_Ymax) - 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) { - GLuint i; - for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) { - bufferMask |= (1 << ctx->DrawBuffer->_ColorDrawBufferIndexes[i]); - } - } - - 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); - } -} - - -/** Returned by make_color_buffer_mask() for errors */ -#define INVALID_MASK ~0x0 - - -/** - * Convert the glClearBuffer 'drawbuffer' parameter into a bitmask of - * BUFFER_BIT_x values. - * Return INVALID_MASK if the drawbuffer value is invalid. - */ -static GLbitfield -make_color_buffer_mask(GLcontext *ctx, GLint drawbuffer) -{ - const struct gl_renderbuffer_attachment *att = ctx->DrawBuffer->Attachment; - GLbitfield mask = 0x0; - - switch (drawbuffer) { - case GL_FRONT: - if (att[BUFFER_FRONT_LEFT].Renderbuffer) - mask |= BUFFER_BIT_FRONT_LEFT; - if (att[BUFFER_FRONT_RIGHT].Renderbuffer) - mask |= BUFFER_BIT_FRONT_RIGHT; - break; - case GL_BACK: - if (att[BUFFER_BACK_LEFT].Renderbuffer) - mask |= BUFFER_BIT_BACK_LEFT; - if (att[BUFFER_BACK_RIGHT].Renderbuffer) - mask |= BUFFER_BIT_BACK_RIGHT; - break; - case GL_LEFT: - if (att[BUFFER_FRONT_LEFT].Renderbuffer) - mask |= BUFFER_BIT_FRONT_LEFT; - if (att[BUFFER_BACK_LEFT].Renderbuffer) - mask |= BUFFER_BIT_BACK_LEFT; - break; - case GL_RIGHT: - if (att[BUFFER_FRONT_RIGHT].Renderbuffer) - mask |= BUFFER_BIT_FRONT_RIGHT; - if (att[BUFFER_BACK_RIGHT].Renderbuffer) - mask |= BUFFER_BIT_BACK_RIGHT; - break; - case GL_FRONT_AND_BACK: - if (att[BUFFER_FRONT_LEFT].Renderbuffer) - mask |= BUFFER_BIT_FRONT_LEFT; - if (att[BUFFER_BACK_LEFT].Renderbuffer) - mask |= BUFFER_BIT_BACK_LEFT; - if (att[BUFFER_FRONT_RIGHT].Renderbuffer) - mask |= BUFFER_BIT_FRONT_RIGHT; - if (att[BUFFER_BACK_RIGHT].Renderbuffer) - mask |= BUFFER_BIT_BACK_RIGHT; - break; - default: - if (drawbuffer < 0 || drawbuffer >= (GLint)ctx->Const.MaxDrawBuffers) { - mask = INVALID_MASK; - } - else if (att[BUFFER_COLOR0 + drawbuffer].Renderbuffer) { - mask |= (BUFFER_BIT_COLOR0 << drawbuffer); - } - } - - return mask; -} - - - -/** - * New in GL 3.0 - * Clear signed integer color buffer or stencil buffer (not depth). - */ -void GLAPIENTRY -_mesa_ClearBufferiv(GLenum buffer, GLint drawbuffer, const GLint *value) -{ - GET_CURRENT_CONTEXT(ctx); - ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); - - FLUSH_CURRENT(ctx, 0); - - if (ctx->NewState) { - _mesa_update_state( ctx ); - } - - switch (buffer) { - case GL_STENCIL: - if (drawbuffer != 0) { - _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferiv(drawbuffer=%d)", - drawbuffer); - return; - } - else { - /* Save current stencil clear value, set to 'value', do the - * stencil clear and restore the clear value. - * XXX in the future we may have a new ctx->Driver.ClearBuffer() - * hook instead. - */ - const GLuint clearSave = ctx->Stencil.Clear; - ctx->Stencil.Clear = *value; - if (ctx->Driver.ClearStencil) - ctx->Driver.ClearStencil(ctx, *value); - ctx->Driver.Clear(ctx, BUFFER_BIT_STENCIL); - ctx->Stencil.Clear = clearSave; - if (ctx->Driver.ClearStencil) - ctx->Driver.ClearStencil(ctx, clearSave); - } - break; - case GL_COLOR: - { - const GLbitfield mask = make_color_buffer_mask(ctx, drawbuffer); - if (mask == INVALID_MASK) { - _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferiv(drawbuffer=%d)", - drawbuffer); - return; - } - else if (mask) { - /* XXX note: we're putting the integer clear values into the - * floating point state var. This will not always work. We'll - * need a new ctx->Driver.ClearBuffer() hook.... - */ - GLclampf clearSave[4]; - /* save color */ - COPY_4V(clearSave, ctx->Color.ClearColor); - /* set color */ - COPY_4V_CAST(ctx->Color.ClearColor, value, GLclampf); - if (ctx->Driver.ClearColor) - ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor); - /* clear buffer(s) */ - ctx->Driver.Clear(ctx, mask); - /* restore color */ - COPY_4V(ctx->Color.ClearColor, clearSave); - if (ctx->Driver.ClearColor) - ctx->Driver.ClearColor(ctx, clearSave); - } - } - break; - default: - _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferiv(buffer=%s)", - _mesa_lookup_enum_by_nr(buffer)); - return; - } -} - - -/** - * New in GL 3.0 - * Clear unsigned integer color buffer (not depth, not stencil). - */ -void GLAPIENTRY -_mesa_ClearBufferuiv(GLenum buffer, GLint drawbuffer, const GLuint *value) -{ - GET_CURRENT_CONTEXT(ctx); - ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); - - FLUSH_CURRENT(ctx, 0); - - if (ctx->NewState) { - _mesa_update_state( ctx ); - } - - switch (buffer) { - case GL_COLOR: - { - const GLbitfield mask = make_color_buffer_mask(ctx, drawbuffer); - if (mask == INVALID_MASK) { - _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferiv(drawbuffer=%d)", - drawbuffer); - return; - } - else if (mask) { - /* XXX note: we're putting the uint clear values into the - * floating point state var. This will not always work. We'll - * need a new ctx->Driver.ClearBuffer() hook.... - */ - GLclampf clearSave[4]; - /* save color */ - COPY_4V(clearSave, ctx->Color.ClearColor); - /* set color */ - COPY_4V_CAST(ctx->Color.ClearColor, value, GLclampf); - if (ctx->Driver.ClearColor) - ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor); - /* clear buffer(s) */ - ctx->Driver.Clear(ctx, mask); - /* restore color */ - COPY_4V(ctx->Color.ClearColor, clearSave); - if (ctx->Driver.ClearColor) - ctx->Driver.ClearColor(ctx, clearSave); - } - } - break; - default: - _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferuiv(buffer=%s)", - _mesa_lookup_enum_by_nr(buffer)); - return; - } -} - - -/** - * New in GL 3.0 - * Clear fixed-pt or float color buffer or depth buffer (not stencil). - */ -void GLAPIENTRY -_mesa_ClearBufferfv(GLenum buffer, GLint drawbuffer, const GLfloat *value) -{ - GET_CURRENT_CONTEXT(ctx); - ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); - - FLUSH_CURRENT(ctx, 0); - - if (ctx->NewState) { - _mesa_update_state( ctx ); - } - - switch (buffer) { - case GL_DEPTH: - if (drawbuffer != 0) { - _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfv(drawbuffer=%d)", - drawbuffer); - return; - } - else { - /* Save current depth clear value, set to 'value', do the - * depth clear and restore the clear value. - * XXX in the future we may have a new ctx->Driver.ClearBuffer() - * hook instead. - */ - const GLclampd clearSave = ctx->Depth.Clear; - ctx->Depth.Clear = *value; - if (ctx->Driver.ClearDepth) - ctx->Driver.ClearDepth(ctx, *value); - ctx->Driver.Clear(ctx, BUFFER_BIT_DEPTH); - ctx->Depth.Clear = clearSave; - if (ctx->Driver.ClearDepth) - ctx->Driver.ClearDepth(ctx, clearSave); - } - /* clear depth buffer to value */ - break; - case GL_COLOR: - { - const GLbitfield mask = make_color_buffer_mask(ctx, drawbuffer); - if (mask == INVALID_MASK) { - _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfv(drawbuffer=%d)", - drawbuffer); - return; - } - else if (mask) { - GLclampf clearSave[4]; - /* save color */ - COPY_4V(clearSave, ctx->Color.ClearColor); - /* set color */ - COPY_4V_CAST(ctx->Color.ClearColor, value, GLclampf); - if (ctx->Driver.ClearColor) - ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor); - /* clear buffer(s) */ - ctx->Driver.Clear(ctx, mask); - /* restore color */ - COPY_4V(ctx->Color.ClearColor, clearSave); - if (ctx->Driver.ClearColor) - ctx->Driver.ClearColor(ctx, clearSave); - } - } - break; - default: - _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferfv(buffer=%s)", - _mesa_lookup_enum_by_nr(buffer)); - return; - } -} - - -/** - * New in GL 3.0 - * Clear depth/stencil buffer only. - */ -void GLAPIENTRY -_mesa_ClearBufferfi(GLenum buffer, GLint drawbuffer, - GLfloat depth, GLint stencil) -{ - GET_CURRENT_CONTEXT(ctx); - ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); - - FLUSH_CURRENT(ctx, 0); - - if (buffer != GL_DEPTH_STENCIL) { - _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferfi(buffer=%s)", - _mesa_lookup_enum_by_nr(buffer)); - return; - } - - if (drawbuffer != 0) { - _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfi(drawbuffer=%d)", - drawbuffer); - return; - } - - if (ctx->NewState) { - _mesa_update_state( ctx ); - } - - { - /* save current clear values */ - const GLclampd clearDepthSave = ctx->Depth.Clear; - const GLuint clearStencilSave = ctx->Stencil.Clear; - - /* set new clear values */ - ctx->Depth.Clear = depth; - ctx->Stencil.Clear = stencil; - if (ctx->Driver.ClearDepth) - ctx->Driver.ClearDepth(ctx, depth); - if (ctx->Driver.ClearStencil) - ctx->Driver.ClearStencil(ctx, stencil); - - /* clear buffers */ - ctx->Driver.Clear(ctx, BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL); - - /* restore */ - ctx->Depth.Clear = clearDepthSave; - ctx->Stencil.Clear = clearStencilSave; - if (ctx->Driver.ClearDepth) - ctx->Driver.ClearDepth(ctx, clearDepthSave); - if (ctx->Driver.ClearStencil) - ctx->Driver.ClearStencil(ctx, clearStencilSave); - } -} +/*
+ * Mesa 3-D graphics library
+ * Version: 7.1
+ *
+ * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * 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.
+ */
+
+
+/**
+ * \file clear.c
+ * glClearColor, glClearIndex, glClear() functions.
+ */
+
+
+
+#include "glheader.h"
+#include "clear.h"
+#include "context.h"
+#include "colormac.h"
+#include "enums.h"
+#include "macros.h"
+#include "state.h"
+
+
+
+#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;
+}
+#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->Driver.ClearColor) {
+ /* it's OK to call glClearColor in CI mode but it should be a NOP */
+ (*ctx->Driver.ClearColor)(ctx, ctx->Color.ClearColor);
+ }
+}
+
+
+/**
+ * GL_EXT_texture_integer
+ */
+void GLAPIENTRY
+_mesa_ClearColorIiEXT(GLint r, GLint g, GLint b, GLint a)
+{
+ GLfloat tmp[4];
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ tmp[0] = (GLfloat) r;
+ tmp[1] = (GLfloat) g;
+ tmp[2] = (GLfloat) b;
+ tmp[3] = (GLfloat) a;
+
+ if (TEST_EQ_4V(tmp, ctx->Color.ClearColor))
+ return; /* no change */
+
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+
+ /* XXX we should eventually have a float/int/uint union for
+ * the ctx->Color.ClearColor state.
+ */
+ COPY_4V(ctx->Color.ClearColor, tmp);
+
+ if (ctx->Driver.ClearColor) {
+ ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);
+ }
+}
+
+
+/**
+ * GL_EXT_texture_integer
+ */
+void GLAPIENTRY
+_mesa_ClearColorIuiEXT(GLuint r, GLuint g, GLuint b, GLuint a)
+{
+ GLfloat tmp[4];
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ tmp[0] = (GLfloat) r;
+ tmp[1] = (GLfloat) g;
+ tmp[2] = (GLfloat) b;
+ tmp[3] = (GLfloat) a;
+
+ if (TEST_EQ_4V(tmp, ctx->Color.ClearColor))
+ return; /* no change */
+
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+
+ /* XXX we should eventually have a float/int/uint union for
+ * the ctx->Color.ClearColor state.
+ */
+ COPY_4V(ctx->Color.ClearColor, tmp);
+
+ if (ctx->Driver.ClearColor) {
+ 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 __struct gl_contextRec::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);
+
+ FLUSH_CURRENT(ctx, 0);
+
+ 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 ||
+ ctx->DrawBuffer->_Xmin >= ctx->DrawBuffer->_Xmax ||
+ ctx->DrawBuffer->_Ymin >= ctx->DrawBuffer->_Ymax)
+ 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) {
+ GLuint i;
+ for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
+ bufferMask |= (1 << ctx->DrawBuffer->_ColorDrawBufferIndexes[i]);
+ }
+ }
+
+ 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);
+ }
+}
+
+
+/** Returned by make_color_buffer_mask() for errors */
+#define INVALID_MASK ~0x0
+
+
+/**
+ * Convert the glClearBuffer 'drawbuffer' parameter into a bitmask of
+ * BUFFER_BIT_x values.
+ * Return INVALID_MASK if the drawbuffer value is invalid.
+ */
+static GLbitfield
+make_color_buffer_mask(struct gl_context *ctx, GLint drawbuffer)
+{
+ const struct gl_renderbuffer_attachment *att = ctx->DrawBuffer->Attachment;
+ GLbitfield mask = 0x0;
+
+ switch (drawbuffer) {
+ case GL_FRONT:
+ if (att[BUFFER_FRONT_LEFT].Renderbuffer)
+ mask |= BUFFER_BIT_FRONT_LEFT;
+ if (att[BUFFER_FRONT_RIGHT].Renderbuffer)
+ mask |= BUFFER_BIT_FRONT_RIGHT;
+ break;
+ case GL_BACK:
+ if (att[BUFFER_BACK_LEFT].Renderbuffer)
+ mask |= BUFFER_BIT_BACK_LEFT;
+ if (att[BUFFER_BACK_RIGHT].Renderbuffer)
+ mask |= BUFFER_BIT_BACK_RIGHT;
+ break;
+ case GL_LEFT:
+ if (att[BUFFER_FRONT_LEFT].Renderbuffer)
+ mask |= BUFFER_BIT_FRONT_LEFT;
+ if (att[BUFFER_BACK_LEFT].Renderbuffer)
+ mask |= BUFFER_BIT_BACK_LEFT;
+ break;
+ case GL_RIGHT:
+ if (att[BUFFER_FRONT_RIGHT].Renderbuffer)
+ mask |= BUFFER_BIT_FRONT_RIGHT;
+ if (att[BUFFER_BACK_RIGHT].Renderbuffer)
+ mask |= BUFFER_BIT_BACK_RIGHT;
+ break;
+ case GL_FRONT_AND_BACK:
+ if (att[BUFFER_FRONT_LEFT].Renderbuffer)
+ mask |= BUFFER_BIT_FRONT_LEFT;
+ if (att[BUFFER_BACK_LEFT].Renderbuffer)
+ mask |= BUFFER_BIT_BACK_LEFT;
+ if (att[BUFFER_FRONT_RIGHT].Renderbuffer)
+ mask |= BUFFER_BIT_FRONT_RIGHT;
+ if (att[BUFFER_BACK_RIGHT].Renderbuffer)
+ mask |= BUFFER_BIT_BACK_RIGHT;
+ break;
+ default:
+ if (drawbuffer < 0 || drawbuffer >= (GLint)ctx->Const.MaxDrawBuffers) {
+ mask = INVALID_MASK;
+ }
+ else if (att[BUFFER_COLOR0 + drawbuffer].Renderbuffer) {
+ mask |= (BUFFER_BIT_COLOR0 << drawbuffer);
+ }
+ }
+
+ return mask;
+}
+
+
+
+/**
+ * New in GL 3.0
+ * Clear signed integer color buffer or stencil buffer (not depth).
+ */
+void GLAPIENTRY
+_mesa_ClearBufferiv(GLenum buffer, GLint drawbuffer, const GLint *value)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ FLUSH_CURRENT(ctx, 0);
+
+ if (ctx->NewState) {
+ _mesa_update_state( ctx );
+ }
+
+ switch (buffer) {
+ case GL_STENCIL:
+ if (drawbuffer != 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferiv(drawbuffer=%d)",
+ drawbuffer);
+ return;
+ }
+ else {
+ /* Save current stencil clear value, set to 'value', do the
+ * stencil clear and restore the clear value.
+ * XXX in the future we may have a new ctx->Driver.ClearBuffer()
+ * hook instead.
+ */
+ const GLuint clearSave = ctx->Stencil.Clear;
+ ctx->Stencil.Clear = *value;
+ if (ctx->Driver.ClearStencil)
+ ctx->Driver.ClearStencil(ctx, *value);
+ ctx->Driver.Clear(ctx, BUFFER_BIT_STENCIL);
+ ctx->Stencil.Clear = clearSave;
+ if (ctx->Driver.ClearStencil)
+ ctx->Driver.ClearStencil(ctx, clearSave);
+ }
+ break;
+ case GL_COLOR:
+ {
+ const GLbitfield mask = make_color_buffer_mask(ctx, drawbuffer);
+ if (mask == INVALID_MASK) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferiv(drawbuffer=%d)",
+ drawbuffer);
+ return;
+ }
+ else if (mask) {
+ /* XXX note: we're putting the integer clear values into the
+ * floating point state var. This will not always work. We'll
+ * need a new ctx->Driver.ClearBuffer() hook....
+ */
+ GLclampf clearSave[4];
+ /* save color */
+ COPY_4V(clearSave, ctx->Color.ClearColor);
+ /* set color */
+ COPY_4V_CAST(ctx->Color.ClearColor, value, GLclampf);
+ if (ctx->Driver.ClearColor)
+ ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);
+ /* clear buffer(s) */
+ ctx->Driver.Clear(ctx, mask);
+ /* restore color */
+ COPY_4V(ctx->Color.ClearColor, clearSave);
+ if (ctx->Driver.ClearColor)
+ ctx->Driver.ClearColor(ctx, clearSave);
+ }
+ }
+ break;
+ default:
+ _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferiv(buffer=%s)",
+ _mesa_lookup_enum_by_nr(buffer));
+ return;
+ }
+}
+
+
+/**
+ * New in GL 3.0
+ * Clear unsigned integer color buffer (not depth, not stencil).
+ */
+void GLAPIENTRY
+_mesa_ClearBufferuiv(GLenum buffer, GLint drawbuffer, const GLuint *value)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ FLUSH_CURRENT(ctx, 0);
+
+ if (ctx->NewState) {
+ _mesa_update_state( ctx );
+ }
+
+ switch (buffer) {
+ case GL_COLOR:
+ {
+ const GLbitfield mask = make_color_buffer_mask(ctx, drawbuffer);
+ if (mask == INVALID_MASK) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferuiv(drawbuffer=%d)",
+ drawbuffer);
+ return;
+ }
+ else if (mask) {
+ /* XXX note: we're putting the uint clear values into the
+ * floating point state var. This will not always work. We'll
+ * need a new ctx->Driver.ClearBuffer() hook....
+ */
+ GLclampf clearSave[4];
+ /* save color */
+ COPY_4V(clearSave, ctx->Color.ClearColor);
+ /* set color */
+ COPY_4V_CAST(ctx->Color.ClearColor, value, GLclampf);
+ if (ctx->Driver.ClearColor)
+ ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);
+ /* clear buffer(s) */
+ ctx->Driver.Clear(ctx, mask);
+ /* restore color */
+ COPY_4V(ctx->Color.ClearColor, clearSave);
+ if (ctx->Driver.ClearColor)
+ ctx->Driver.ClearColor(ctx, clearSave);
+ }
+ }
+ break;
+ default:
+ _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferuiv(buffer=%s)",
+ _mesa_lookup_enum_by_nr(buffer));
+ return;
+ }
+}
+
+
+/**
+ * New in GL 3.0
+ * Clear fixed-pt or float color buffer or depth buffer (not stencil).
+ */
+void GLAPIENTRY
+_mesa_ClearBufferfv(GLenum buffer, GLint drawbuffer, const GLfloat *value)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ FLUSH_CURRENT(ctx, 0);
+
+ if (ctx->NewState) {
+ _mesa_update_state( ctx );
+ }
+
+ switch (buffer) {
+ case GL_DEPTH:
+ if (drawbuffer != 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfv(drawbuffer=%d)",
+ drawbuffer);
+ return;
+ }
+ else {
+ /* Save current depth clear value, set to 'value', do the
+ * depth clear and restore the clear value.
+ * XXX in the future we may have a new ctx->Driver.ClearBuffer()
+ * hook instead.
+ */
+ const GLclampd clearSave = ctx->Depth.Clear;
+ ctx->Depth.Clear = *value;
+ if (ctx->Driver.ClearDepth)
+ ctx->Driver.ClearDepth(ctx, *value);
+ ctx->Driver.Clear(ctx, BUFFER_BIT_DEPTH);
+ ctx->Depth.Clear = clearSave;
+ if (ctx->Driver.ClearDepth)
+ ctx->Driver.ClearDepth(ctx, clearSave);
+ }
+ /* clear depth buffer to value */
+ break;
+ case GL_COLOR:
+ {
+ const GLbitfield mask = make_color_buffer_mask(ctx, drawbuffer);
+ if (mask == INVALID_MASK) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfv(drawbuffer=%d)",
+ drawbuffer);
+ return;
+ }
+ else if (mask) {
+ GLclampf clearSave[4];
+ /* save color */
+ COPY_4V(clearSave, ctx->Color.ClearColor);
+ /* set color */
+ COPY_4V_CAST(ctx->Color.ClearColor, value, GLclampf);
+ if (ctx->Driver.ClearColor)
+ ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);
+ /* clear buffer(s) */
+ ctx->Driver.Clear(ctx, mask);
+ /* restore color */
+ COPY_4V(ctx->Color.ClearColor, clearSave);
+ if (ctx->Driver.ClearColor)
+ ctx->Driver.ClearColor(ctx, clearSave);
+ }
+ }
+ break;
+ default:
+ _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferfv(buffer=%s)",
+ _mesa_lookup_enum_by_nr(buffer));
+ return;
+ }
+}
+
+
+/**
+ * New in GL 3.0
+ * Clear depth/stencil buffer only.
+ */
+void GLAPIENTRY
+_mesa_ClearBufferfi(GLenum buffer, GLint drawbuffer,
+ GLfloat depth, GLint stencil)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ FLUSH_CURRENT(ctx, 0);
+
+ if (buffer != GL_DEPTH_STENCIL) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferfi(buffer=%s)",
+ _mesa_lookup_enum_by_nr(buffer));
+ return;
+ }
+
+ if (drawbuffer != 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfi(drawbuffer=%d)",
+ drawbuffer);
+ return;
+ }
+
+ if (ctx->NewState) {
+ _mesa_update_state( ctx );
+ }
+
+ {
+ /* save current clear values */
+ const GLclampd clearDepthSave = ctx->Depth.Clear;
+ const GLuint clearStencilSave = ctx->Stencil.Clear;
+
+ /* set new clear values */
+ ctx->Depth.Clear = depth;
+ ctx->Stencil.Clear = stencil;
+ if (ctx->Driver.ClearDepth)
+ ctx->Driver.ClearDepth(ctx, depth);
+ if (ctx->Driver.ClearStencil)
+ ctx->Driver.ClearStencil(ctx, stencil);
+
+ /* clear buffers */
+ ctx->Driver.Clear(ctx, BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL);
+
+ /* restore */
+ ctx->Depth.Clear = clearDepthSave;
+ ctx->Stencil.Clear = clearStencilSave;
+ if (ctx->Driver.ClearDepth)
+ ctx->Driver.ClearDepth(ctx, clearDepthSave);
+ if (ctx->Driver.ClearStencil)
+ ctx->Driver.ClearStencil(ctx, clearStencilSave);
+ }
+}
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