/*
* 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.
*/
#include "main/glheader.h"
#include "main/context.h"
#include "main/macros.h"
#include "main/multisample.h"
#include "main/mtypes.h"
#include "main/fbobject.h"
#include "main/glformats.h"
#include "main/state.h"
/**
* Called via glSampleCoverageARB
*/
void GLAPIENTRY
_mesa_SampleCoverage(GLclampf value, GLboolean invert)
{
GET_CURRENT_CONTEXT(ctx);
FLUSH_VERTICES(ctx, 0);
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(struct gl_context *ctx)
{
ctx->Multisample.Enabled = GL_TRUE;
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;
/* ARB_texture_multisample / GL3.2 additions */
ctx->Multisample.SampleMask = GL_FALSE;
ctx->Multisample.SampleMaskValue = ~(GLbitfield)0;
}
void GLAPIENTRY
_mesa_GetMultisamplefv(GLenum pname, GLuint index, GLfloat * val)
{
GET_CURRENT_CONTEXT(ctx);
if (ctx->NewState & _NEW_BUFFERS) {
_mesa_update_state(ctx);
}
switch (pname) {
case GL_SAMPLE_POSITION: {
if ((int) index >= ctx->DrawBuffer->Visual.samples) {
_mesa_error( ctx, GL_INVALID_VALUE, "glGetMultisamplefv(index)" );
return;
}
ctx->Driver.GetSamplePosition(ctx, ctx->DrawBuffer, index, val);
/* winsys FBOs are upside down */
if (_mesa_is_winsys_fbo(ctx->DrawBuffer))
val[1] = 1.0f - val[1];
return;
}
default:
_mesa_error( ctx, GL_INVALID_ENUM, "glGetMultisamplefv(pname)" );
return;
}
}
void GLAPIENTRY
_mesa_SampleMaski(GLuint index, GLbitfield mask)
{
GET_CURRENT_CONTEXT(ctx);
if (!ctx->Extensions.ARB_texture_multisample) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glSampleMaski");
return;
}
if (index != 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "glSampleMaski(index)");
return;
}
FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
ctx->Multisample.SampleMaskValue = mask;
}
/**
* Called via glMinSampleShadingARB
*/
void GLAPIENTRY
_mesa_MinSampleShading(GLclampf value)
{
GET_CURRENT_CONTEXT(ctx);
if (!ctx->Extensions.ARB_sample_shading || !_mesa_is_desktop_gl(ctx)) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glMinSampleShading");
return;
}
FLUSH_VERTICES(ctx, 0);
ctx->Multisample.MinSampleShadingValue = CLAMP(value, 0.0, 1.0);
ctx->NewState |= _NEW_MULTISAMPLE;
}
/**
* Helper for checking a requested sample count against the limit
* for a particular (target, internalFormat) pair. The limit imposed,
* and the error generated, both depend on which extensions are supported.
*
* Returns a GL error enum, or GL_NO_ERROR if the requested sample count is
* acceptable.
*/
GLenum
_mesa_check_sample_count(struct gl_context *ctx, GLenum target,
GLenum internalFormat, GLsizei samples)
{
/* Section 2.5 (GL Errors) of OpenGL 3.0 specification, page 16:
*
* "If a negative number is provided where an argument of type sizei or
* sizeiptr is specified, the error INVALID VALUE is generated."
*/
if (samples < 0) {
return GL_INVALID_VALUE;
}
/* Section 4.4 (Framebuffer objects), page 198 of the OpenGL ES 3.0.0
* specification says:
*
* "If internalformat is a signed or unsigned integer format and samples
* is greater than zero, then the error INVALID_OPERATION is generated."
*/
if (_mesa_is_gles3(ctx) && _mesa_is_enum_format_integer(internalFormat)
&& samples > 0) {
return GL_INVALID_OPERATION;
}
/* If ARB_internalformat_query is supported, then treat its highest
* returned sample count as the absolute maximum for this format; it is
* allowed to exceed MAX_SAMPLES.
*
* From the ARB_internalformat_query spec:
*
* "If <samples is greater than the maximum number of samples supported
* for <internalformat> then the error INVALID_OPERATION is generated."
*/
if (ctx->Extensions.ARB_internalformat_query) {
GLint buffer[16];
int count = ctx->Driver.QuerySamplesForFormat(ctx, target,
internalFormat, buffer);
int limit = count ? buffer[0] : -1;
return samples > limit ? GL_INVALID_OPERATION : GL_NO_ERROR;
}
/* If ARB_texture_multisample is supported, we have separate limits,
* which may be lower than MAX_SAMPLES:
*
* From the ARB_texture_multisample spec, when describing the operation
* of RenderbufferStorageMultisample:
*
* "If <internalformat> is a signed or unsigned integer format and
* <samples> is greater than the value of MAX_INTEGER_SAMPLES, then the
* error INVALID_OPERATION is generated"
*
* And when describing the operation of TexImage*Multisample:
*
* "The error INVALID_OPERATION may be generated if any of the following
* are true:
*
* * <internalformat> is a depth/stencil-renderable format and <samples>
* is greater than the value of MAX_DEPTH_TEXTURE_SAMPLES
* * <internalformat> is a color-renderable format and <samples> is
* grater than the value of MAX_COLOR_TEXTURE_SAMPLES
* * <internalformat> is a signed or unsigned integer format and
* <samples> is greater than the value of MAX_INTEGER_SAMPLES
*/
if (ctx->Extensions.ARB_texture_multisample) {
if (_mesa_is_enum_format_integer(internalFormat))
return samples > ctx->Const.MaxIntegerSamples
? GL_INVALID_OPERATION : GL_NO_ERROR;
if (target == GL_TEXTURE_2D_MULTISAMPLE ||
target == GL_TEXTURE_2D_MULTISAMPLE_ARRAY) {
if (_mesa_is_depth_or_stencil_format(internalFormat))
return samples > ctx->Const.MaxDepthTextureSamples
? GL_INVALID_OPERATION : GL_NO_ERROR;
else
return samples > ctx->Const.MaxColorTextureSamples
? GL_INVALID_OPERATION : GL_NO_ERROR;
}
}
/* No more specific limit is available, so just use MAX_SAMPLES:
*
* On p205 of the GL3.1 spec:
*
* "... or if samples is greater than MAX_SAMPLES, then the error
* INVALID_VALUE is generated"
*/
return (GLuint) samples > ctx->Const.MaxSamples
? GL_INVALID_VALUE : GL_NO_ERROR;
}