/* * 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 * THE AUTHORS 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 (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 - 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; } /* 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) { /* 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 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 is a signed or unsigned integer format and * 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: * * * is a depth/stencil-renderable format and * is greater than the value of MAX_DEPTH_TEXTURE_SAMPLES * * is a color-renderable format and is * grater than the value of MAX_COLOR_TEXTURE_SAMPLES * * is a signed or unsigned integer format and * 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 samples > ctx->Const.MaxSamples ? GL_INVALID_VALUE : GL_NO_ERROR; }