/*
* Mesa 3-D graphics library
*
* 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
* 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.
*/
/**
* \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 "mtypes.h"
#include "state.h"
void GLAPIENTRY
_mesa_ClearIndex( GLfloat c )
{
GET_CURRENT_CONTEXT(ctx);
ctx->Color.ClearIndex = (GLuint) c;
}
/**
* 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 )
{
GET_CURRENT_CONTEXT(ctx);
ctx->Color.ClearColor.f[0] = red;
ctx->Color.ClearColor.f[1] = green;
ctx->Color.ClearColor.f[2] = blue;
ctx->Color.ClearColor.f[3] = alpha;
}
/**
* GL_EXT_texture_integer
*/
void GLAPIENTRY
_mesa_ClearColorIiEXT(GLint r, GLint g, GLint b, GLint a)
{
GET_CURRENT_CONTEXT(ctx);
ctx->Color.ClearColor.i[0] = r;
ctx->Color.ClearColor.i[1] = g;
ctx->Color.ClearColor.i[2] = b;
ctx->Color.ClearColor.i[3] = a;
}
/**
* GL_EXT_texture_integer
*/
void GLAPIENTRY
_mesa_ClearColorIuiEXT(GLuint r, GLuint g, GLuint b, GLuint a)
{
GET_CURRENT_CONTEXT(ctx);
ctx->Color.ClearColor.ui[0] = r;
ctx->Color.ClearColor.ui[1] = g;
ctx->Color.ClearColor.ui[2] = b;
ctx->Color.ClearColor.ui[3] = a;
}
/**
* 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);
FLUSH_VERTICES(ctx, 0);
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;
}
/* Accumulation buffers were removed in core contexts, and they never
* existed in OpenGL ES.
*/
if ((mask & GL_ACCUM_BUFFER_BIT) != 0
&& (ctx->API == API_OPENGL_CORE || _mesa_is_gles(ctx))) {
_mesa_error( ctx, GL_INVALID_VALUE, "glClear(GL_ACCUM_BUFFER_BIT)");
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->RasterDiscard)
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);
FLUSH_VERTICES(ctx, 0);
FLUSH_CURRENT(ctx, 0);
if (ctx->NewState) {
_mesa_update_state( ctx );
}
switch (buffer) {
case GL_STENCIL:
/* Page 264 (page 280 of the PDF) of the OpenGL 3.0 spec says:
*
* "ClearBuffer generates an INVALID VALUE error if buffer is
* COLOR and drawbuffer is less than zero, or greater than the
* value of MAX DRAW BUFFERS minus one; or if buffer is DEPTH,
* STENCIL, or DEPTH STENCIL and drawbuffer is not zero."
*/
if (drawbuffer != 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferiv(drawbuffer=%d)",
drawbuffer);
return;
}
else if (ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer && !ctx->RasterDiscard) {
/* 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;
ctx->Driver.Clear(ctx, BUFFER_BIT_STENCIL);
ctx->Stencil.Clear = 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 && !ctx->RasterDiscard) {
union gl_color_union clearSave;
/* save color */
clearSave = ctx->Color.ClearColor;
/* set color */
COPY_4V(ctx->Color.ClearColor.i, value);
/* clear buffer(s) */
ctx->Driver.Clear(ctx, mask);
/* restore color */
ctx->Color.ClearColor = clearSave;
}
}
break;
case GL_DEPTH:
/* Page 264 (page 280 of the PDF) of the OpenGL 3.0 spec says:
*
* "The result of ClearBuffer is undefined if no conversion between
* the type of the specified value and the type of the buffer being
* cleared is defined (for example, if ClearBufferiv is called for a
* fixed- or floating-point buffer, or if ClearBufferfv is called
* for a signed or unsigned integer buffer). This is not an error."
*
* In this case we take "undefined" and "not an error" to mean "ignore."
* Note that we still need to generate an error for the invalid
* drawbuffer case (see the GL_STENCIL case above).
*/
if (drawbuffer != 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferiv(drawbuffer=%d)",
drawbuffer);
return;
}
return;
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);
FLUSH_VERTICES(ctx, 0);
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 && !ctx->RasterDiscard) {
union gl_color_union clearSave;
/* save color */
clearSave = ctx->Color.ClearColor;
/* set color */
COPY_4V(ctx->Color.ClearColor.ui, value);
/* clear buffer(s) */
ctx->Driver.Clear(ctx, mask);
/* restore color */
ctx->Color.ClearColor = clearSave;
}
}
break;
case GL_DEPTH:
case GL_STENCIL:
/* Page 264 (page 280 of the PDF) of the OpenGL 3.0 spec says:
*
* "The result of ClearBuffer is undefined if no conversion between
* the type of the specified value and the type of the buffer being
* cleared is defined (for example, if ClearBufferiv is called for a
* fixed- or floating-point buffer, or if ClearBufferfv is called
* for a signed or unsigned integer buffer). This is not an error."
*
* In this case we take "undefined" and "not an error" to mean "ignore."
* Even though we could do something sensible for GL_STENCIL, page 263
* (page 279 of the PDF) says:
*
* "Only ClearBufferiv should be used to clear stencil buffers."
*
* Note that we still need to generate an error for the invalid
* drawbuffer case (see the GL_STENCIL case in _mesa_ClearBufferiv).
*/
if (drawbuffer != 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferuiv(drawbuffer=%d)",
drawbuffer);
return;
}
return;
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);
FLUSH_VERTICES(ctx, 0);
FLUSH_CURRENT(ctx, 0);
if (ctx->NewState) {
_mesa_update_state( ctx );
}
switch (buffer) {
case GL_DEPTH:
/* Page 264 (page 280 of the PDF) of the OpenGL 3.0 spec says:
*
* "ClearBuffer generates an INVALID VALUE error if buffer is
* COLOR and drawbuffer is less than zero, or greater than the
* value of MAX DRAW BUFFERS minus one; or if buffer is DEPTH,
* STENCIL, or DEPTH STENCIL and drawbuffer is not zero."
*/
if (drawbuffer != 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfv(drawbuffer=%d)",
drawbuffer);
return;
}
else if (ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer && !ctx->RasterDiscard) {
/* 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;
ctx->Driver.Clear(ctx, BUFFER_BIT_DEPTH);
ctx->Depth.Clear = 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 && !ctx->RasterDiscard) {
union gl_color_union clearSave;
/* save color */
clearSave = ctx->Color.ClearColor;
/* set color */
COPY_4V(ctx->Color.ClearColor.f, value);
/* clear buffer(s) */
ctx->Driver.Clear(ctx, mask);
/* restore color */
ctx->Color.ClearColor = clearSave;
}
}
break;
case GL_STENCIL:
/* Page 264 (page 280 of the PDF) of the OpenGL 3.0 spec says:
*
* "The result of ClearBuffer is undefined if no conversion between
* the type of the specified value and the type of the buffer being
* cleared is defined (for example, if ClearBufferiv is called for a
* fixed- or floating-point buffer, or if ClearBufferfv is called
* for a signed or unsigned integer buffer). This is not an error."
*
* In this case we take "undefined" and "not an error" to mean "ignore."
* Note that we still need to generate an error for the invalid
* drawbuffer case (see the GL_DEPTH case above).
*/
if (drawbuffer != 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfv(drawbuffer=%d)",
drawbuffer);
return;
}
return;
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);
GLbitfield mask = 0;
FLUSH_VERTICES(ctx, 0);
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;
}
/* Page 264 (page 280 of the PDF) of the OpenGL 3.0 spec says:
*
* "ClearBuffer generates an INVALID VALUE error if buffer is
* COLOR and drawbuffer is less than zero, or greater than the
* value of MAX DRAW BUFFERS minus one; or if buffer is DEPTH,
* STENCIL, or DEPTH STENCIL and drawbuffer is not zero."
*/
if (drawbuffer != 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfi(drawbuffer=%d)",
drawbuffer);
return;
}
if (ctx->RasterDiscard)
return;
if (ctx->NewState) {
_mesa_update_state( ctx );
}
if (ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer)
mask |= BUFFER_BIT_DEPTH;
if (ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer)
mask |= BUFFER_BIT_STENCIL;
if (mask) {
/* 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;
/* clear buffers */
ctx->Driver.Clear(ctx, mask);
/* restore */
ctx->Depth.Clear = clearDepthSave;
ctx->Stencil.Clear = clearStencilSave;
}
}