/* * Copyright © 2012 Intel Corporation * * 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 (including the next * paragraph) 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 "mtypes.h" #include "context.h" #include "glformats.h" #include "macros.h" #include "enums.h" #include "fbobject.h" #include "formatquery.h" /* default implementation of QuerySamplesForFormat driverfunc, for * non-multisample-capable drivers. */ size_t _mesa_query_samples_for_format(struct gl_context *ctx, GLenum target, GLenum internalFormat, int samples[16]) { (void) target; (void) internalFormat; (void) ctx; samples[0] = 1; return 1; } void GLAPIENTRY _mesa_GetInternalformativ(GLenum target, GLenum internalformat, GLenum pname, GLsizei bufSize, GLint *params) { GLint buffer[16]; GLsizei count = 0; GET_CURRENT_CONTEXT(ctx); ASSERT_OUTSIDE_BEGIN_END(ctx); if (!ctx->Extensions.ARB_internalformat_query) { _mesa_error(ctx, GL_INVALID_OPERATION, "glGetInternalformativ"); return; } assert(ctx->Driver.QuerySamplesForFormat != NULL); /* The ARB_internalformat_query spec says: * * "If the <target> parameter to GetInternalformativ is not one of * TEXTURE_2D_MULTISAMPLE, TEXTURE_2D_MULTISAMPLE_ARRAY or RENDERBUFFER * then an INVALID_ENUM error is generated." */ switch (target) { case GL_RENDERBUFFER: break; case GL_TEXTURE_2D_MULTISAMPLE: case GL_TEXTURE_2D_MULTISAMPLE_ARRAY: /* These enums are only valid if ARB_texture_multisample is supported */ if (_mesa_is_desktop_gl(ctx) && ctx->Extensions.ARB_texture_multisample) break; default: _mesa_error(ctx, GL_INVALID_ENUM, "glGetInternalformativ(target=%s)", _mesa_lookup_enum_by_nr(target)); return; } /* The ARB_internalformat_query spec says: * * "If the <internalformat> parameter to GetInternalformativ is not * color-, depth- or stencil-renderable, then an INVALID_ENUM error is * generated." * * Page 243 of the GLES 3.0.4 spec says this for GetInternalformativ: * * "internalformat must be color-renderable, depth-renderable or * stencilrenderable (as defined in section 4.4.4)." * * Section 4.4.4 on page 212 of the same spec says: * * "An internal format is color-renderable if it is one of the * formats from table 3.13 noted as color-renderable or if it * is unsized format RGBA or RGB." * * Therefore, we must accept GL_RGB and GL_RGBA here. */ if (internalformat != GL_RGB && internalformat != GL_RGBA && _mesa_base_fbo_format(ctx, internalformat) == 0) { _mesa_error(ctx, GL_INVALID_ENUM, "glGetInternalformativ(internalformat=%s)", _mesa_lookup_enum_by_nr(internalformat)); return; } /* The ARB_internalformat_query spec says: * * "If the <bufSize> parameter to GetInternalformativ is negative, then * an INVALID_VALUE error is generated." */ if (bufSize < 0) { _mesa_error(ctx, GL_INVALID_VALUE, "glGetInternalformativ(target=%s)", _mesa_lookup_enum_by_nr(target)); return; } switch (pname) { case GL_SAMPLES: count = ctx->Driver.QuerySamplesForFormat(ctx, target, internalformat, buffer); break; case GL_NUM_SAMPLE_COUNTS: { if (_mesa_is_gles3(ctx) && _mesa_is_enum_format_integer(internalformat)) { /* From GL ES 3.0 specification, section 6.1.15 page 236: "Since * multisampling is not supported for signed and unsigned integer * internal formats, the value of NUM_SAMPLE_COUNTS will be zero * for such formats. */ buffer[0] = 0; count = 1; } else { size_t num_samples; /* The driver can return 0, and we should pass that along to the * application. The ARB decided that ARB_internalformat_query should * behave as ARB_internalformat_query2 in this situation. * * The ARB_internalformat_query2 spec says: * * "- NUM_SAMPLE_COUNTS: The number of sample counts that would be * returned by querying SAMPLES is returned in <params>. * * If <internalformat> is not color-renderable, * depth-renderable, or stencil-renderable (as defined in * section 4.4.4), or if <target> does not support multiple * samples (ie other than TEXTURE_2D_MULTISAMPLE, * TEXTURE_2D_MULTISAMPLE_ARRAY, or RENDERBUFFER), 0 is * returned." */ num_samples = ctx->Driver.QuerySamplesForFormat(ctx, target, internalformat, buffer); /* QuerySamplesForFormat writes some stuff to buffer, so we have to * separately over-write it with the requested value. */ buffer[0] = (GLint) num_samples; count = 1; } break; } default: _mesa_error(ctx, GL_INVALID_ENUM, "glGetInternalformativ(pname=%s)", _mesa_lookup_enum_by_nr(pname)); return; } if (bufSize != 0 && params == NULL) { /* Emit a warning to aid application debugging, but go ahead and do the * memcpy (and probably crash) anyway. */ _mesa_warning(ctx, "glGetInternalformativ(bufSize = %d, but params = NULL)", bufSize); } /* Copy the data from the temporary buffer to the buffer supplied by the * application. Clamp the size of the copy to the size supplied by the * application. */ memcpy(params, buffer, MIN2(count, bufSize) * sizeof(GLint)); return; }