/* * Mesa 3-D graphics library * * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. * Copyright (C) 1999-2013 VMware, Inc. 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. */ /* * glBlitFramebuffer functions. */ #include <stdbool.h> #include "context.h" #include "enums.h" #include "blit.h" #include "fbobject.h" #include "glformats.h" #include "mtypes.h" #include "state.h" /** Set this to 1 to debug/log glBlitFramebuffer() calls */ #define DEBUG_BLIT 0 static const struct gl_renderbuffer_attachment * find_attachment(const struct gl_framebuffer *fb, const struct gl_renderbuffer *rb) { GLuint i; for (i = 0; i < Elements(fb->Attachment); i++) { if (fb->Attachment[i].Renderbuffer == rb) return &fb->Attachment[i]; } return NULL; } /** * Helper function for checking if the datatypes of color buffers are * compatible for glBlitFramebuffer. From the 3.1 spec, page 198: * * "GL_INVALID_OPERATION is generated if mask contains GL_COLOR_BUFFER_BIT * and any of the following conditions hold: * - The read buffer contains fixed-point or floating-point values and any * draw buffer contains neither fixed-point nor floating-point values. * - The read buffer contains unsigned integer values and any draw buffer * does not contain unsigned integer values. * - The read buffer contains signed integer values and any draw buffer * does not contain signed integer values." */ static GLboolean compatible_color_datatypes(mesa_format srcFormat, mesa_format dstFormat) { GLenum srcType = _mesa_get_format_datatype(srcFormat); GLenum dstType = _mesa_get_format_datatype(dstFormat); if (srcType != GL_INT && srcType != GL_UNSIGNED_INT) { assert(srcType == GL_UNSIGNED_NORMALIZED || srcType == GL_SIGNED_NORMALIZED || srcType == GL_FLOAT); /* Boil any of those types down to GL_FLOAT */ srcType = GL_FLOAT; } if (dstType != GL_INT && dstType != GL_UNSIGNED_INT) { assert(dstType == GL_UNSIGNED_NORMALIZED || dstType == GL_SIGNED_NORMALIZED || dstType == GL_FLOAT); /* Boil any of those types down to GL_FLOAT */ dstType = GL_FLOAT; } return srcType == dstType; } static GLboolean compatible_resolve_formats(const struct gl_renderbuffer *readRb, const struct gl_renderbuffer *drawRb) { GLenum readFormat, drawFormat; /* The simple case where we know the backing Mesa formats are the same. */ if (_mesa_get_srgb_format_linear(readRb->Format) == _mesa_get_srgb_format_linear(drawRb->Format)) { return GL_TRUE; } /* The Mesa formats are different, so we must check whether the internal * formats are compatible. * * Under some circumstances, the user may request e.g. two GL_RGBA8 * textures and get two entirely different Mesa formats like RGBA8888 and * ARGB8888. Drivers behaving like that should be able to cope with * non-matching formats by themselves, because it's not the user's fault. * * Blits between linear and sRGB formats are also allowed. */ readFormat = _mesa_get_nongeneric_internalformat(readRb->InternalFormat); drawFormat = _mesa_get_nongeneric_internalformat(drawRb->InternalFormat); readFormat = _mesa_get_linear_internalformat(readFormat); drawFormat = _mesa_get_linear_internalformat(drawFormat); if (readFormat == drawFormat) { return GL_TRUE; } return GL_FALSE; } static GLboolean is_valid_blit_filter(const struct gl_context *ctx, GLenum filter) { switch (filter) { case GL_NEAREST: case GL_LINEAR: return true; case GL_SCALED_RESOLVE_FASTEST_EXT: case GL_SCALED_RESOLVE_NICEST_EXT: return ctx->Extensions.EXT_framebuffer_multisample_blit_scaled; default: return false; } } /** * Blit rectangular region, optionally from one framebuffer to another. * * Note, if the src buffer is multisampled and the dest is not, this is * when the samples must be resolved to a single color. */ void GLAPIENTRY _mesa_BlitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, GLbitfield mask, GLenum filter) { const GLbitfield legalMaskBits = (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); const struct gl_framebuffer *readFb, *drawFb; GET_CURRENT_CONTEXT(ctx); FLUSH_VERTICES(ctx, 0); if (MESA_VERBOSE & VERBOSE_API) _mesa_debug(ctx, "glBlitFramebuffer(%d, %d, %d, %d, %d, %d, %d, %d, 0x%x, %s)\n", srcX0, srcY0, srcX1, srcY1, dstX0, dstY0, dstX1, dstY1, mask, _mesa_lookup_enum_by_nr(filter)); if (ctx->NewState) { _mesa_update_state(ctx); } readFb = ctx->ReadBuffer; drawFb = ctx->DrawBuffer; if (!readFb || !drawFb) { /* This will normally never happen but someday we may want to * support MakeCurrent() with no drawables. */ return; } /* check for complete framebuffers */ if (drawFb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT || readFb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) { _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT, "glBlitFramebufferEXT(incomplete draw/read buffers)"); return; } if (!is_valid_blit_filter(ctx, filter)) { _mesa_error(ctx, GL_INVALID_ENUM, "glBlitFramebufferEXT(%s)", _mesa_lookup_enum_by_nr(filter)); return; } if ((filter == GL_SCALED_RESOLVE_FASTEST_EXT || filter == GL_SCALED_RESOLVE_NICEST_EXT) && (readFb->Visual.samples == 0 || drawFb->Visual.samples > 0)) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebufferEXT(%s)", _mesa_lookup_enum_by_nr(filter)); return; } if (mask & ~legalMaskBits) { _mesa_error( ctx, GL_INVALID_VALUE, "glBlitFramebufferEXT(mask)"); return; } /* depth/stencil must be blitted with nearest filtering */ if ((mask & (GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT)) && filter != GL_NEAREST) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebufferEXT(depth/stencil requires GL_NEAREST filter)"); return; } /* get color read/draw renderbuffers */ if (mask & GL_COLOR_BUFFER_BIT) { const GLuint numColorDrawBuffers = ctx->DrawBuffer->_NumColorDrawBuffers; const struct gl_renderbuffer *colorReadRb = readFb->_ColorReadBuffer; const struct gl_renderbuffer *colorDrawRb = NULL; GLuint i; /* From the EXT_framebuffer_object spec: * * "If a buffer is specified in <mask> and does not exist in both * the read and draw framebuffers, the corresponding bit is silently * ignored." */ if (!colorReadRb || numColorDrawBuffers == 0) { mask &= ~GL_COLOR_BUFFER_BIT; } else { for (i = 0; i < numColorDrawBuffers; i++) { colorDrawRb = ctx->DrawBuffer->_ColorDrawBuffers[i]; if (!colorDrawRb) continue; /* Page 193 (page 205 of the PDF) in section 4.3.2 of the OpenGL * ES 3.0.1 spec says: * * "If the source and destination buffers are identical, an * INVALID_OPERATION error is generated. Different mipmap * levels of a texture, different layers of a three- * dimensional texture or two-dimensional array texture, and * different faces of a cube map texture do not constitute * identical buffers." */ if (_mesa_is_gles3(ctx) && (colorDrawRb == colorReadRb)) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebuffer(source and destination color " "buffer cannot be the same)"); return; } if (!compatible_color_datatypes(colorReadRb->Format, colorDrawRb->Format)) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebufferEXT(color buffer datatypes mismatch)"); return; } /* extra checks for multisample copies... */ if (readFb->Visual.samples > 0 || drawFb->Visual.samples > 0) { /* color formats must match */ if (!compatible_resolve_formats(colorReadRb, colorDrawRb)) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebufferEXT(bad src/dst multisample pixel formats)"); return; } } } if (filter != GL_NEAREST) { /* From EXT_framebuffer_multisample_blit_scaled specification: * "Calling BlitFramebuffer will result in an INVALID_OPERATION error * if filter is not NEAREST and read buffer contains integer data." */ GLenum type = _mesa_get_format_datatype(colorReadRb->Format); if (type == GL_INT || type == GL_UNSIGNED_INT) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebufferEXT(integer color type)"); return; } } } } if (mask & GL_STENCIL_BUFFER_BIT) { struct gl_renderbuffer *readRb = readFb->Attachment[BUFFER_STENCIL].Renderbuffer; struct gl_renderbuffer *drawRb = drawFb->Attachment[BUFFER_STENCIL].Renderbuffer; /* From the EXT_framebuffer_object spec: * * "If a buffer is specified in <mask> and does not exist in both * the read and draw framebuffers, the corresponding bit is silently * ignored." */ if ((readRb == NULL) || (drawRb == NULL)) { mask &= ~GL_STENCIL_BUFFER_BIT; } else { int read_z_bits, draw_z_bits; if (_mesa_is_gles3(ctx) && (drawRb == readRb)) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebuffer(source and destination stencil " "buffer cannot be the same)"); return; } if (_mesa_get_format_bits(readRb->Format, GL_STENCIL_BITS) != _mesa_get_format_bits(drawRb->Format, GL_STENCIL_BITS)) { /* There is no need to check the stencil datatype here, because * there is only one: GL_UNSIGNED_INT. */ _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebuffer(stencil attachment format mismatch)"); return; } read_z_bits = _mesa_get_format_bits(readRb->Format, GL_DEPTH_BITS); draw_z_bits = _mesa_get_format_bits(drawRb->Format, GL_DEPTH_BITS); /* If both buffers also have depth data, the depth formats must match * as well. If one doesn't have depth, it's not blitted, so we should * ignore the depth format check. */ if (read_z_bits > 0 && draw_z_bits > 0 && (read_z_bits != draw_z_bits || _mesa_get_format_datatype(readRb->Format) != _mesa_get_format_datatype(drawRb->Format))) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebuffer" "(stencil attachment depth format mismatch)"); return; } } } if (mask & GL_DEPTH_BUFFER_BIT) { struct gl_renderbuffer *readRb = readFb->Attachment[BUFFER_DEPTH].Renderbuffer; struct gl_renderbuffer *drawRb = drawFb->Attachment[BUFFER_DEPTH].Renderbuffer; /* From the EXT_framebuffer_object spec: * * "If a buffer is specified in <mask> and does not exist in both * the read and draw framebuffers, the corresponding bit is silently * ignored." */ if ((readRb == NULL) || (drawRb == NULL)) { mask &= ~GL_DEPTH_BUFFER_BIT; } else { int read_s_bit, draw_s_bit; if (_mesa_is_gles3(ctx) && (drawRb == readRb)) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebuffer(source and destination depth " "buffer cannot be the same)"); return; } if ((_mesa_get_format_bits(readRb->Format, GL_DEPTH_BITS) != _mesa_get_format_bits(drawRb->Format, GL_DEPTH_BITS)) || (_mesa_get_format_datatype(readRb->Format) != _mesa_get_format_datatype(drawRb->Format))) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebuffer(depth attachment format mismatch)"); return; } read_s_bit = _mesa_get_format_bits(readRb->Format, GL_STENCIL_BITS); draw_s_bit = _mesa_get_format_bits(drawRb->Format, GL_STENCIL_BITS); /* If both buffers also have stencil data, the stencil formats must * match as well. If one doesn't have stencil, it's not blitted, so * we should ignore the stencil format check. */ if (read_s_bit > 0 && draw_s_bit > 0 && read_s_bit != draw_s_bit) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebuffer" "(depth attachment stencil bits mismatch)"); return; } } } if (_mesa_is_gles3(ctx)) { /* Page 194 (page 206 of the PDF) in section 4.3.2 of the OpenGL ES * 3.0.1 spec says: * * "If SAMPLE_BUFFERS for the draw framebuffer is greater than zero, * an INVALID_OPERATION error is generated." */ if (drawFb->Visual.samples > 0) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebuffer(destination samples must be 0)"); return; } /* Page 194 (page 206 of the PDF) in section 4.3.2 of the OpenGL ES * 3.0.1 spec says: * * "If SAMPLE_BUFFERS for the read framebuffer is greater than zero, * no copy is performed and an INVALID_OPERATION error is generated * if the formats of the read and draw framebuffers are not * identical or if the source and destination rectangles are not * defined with the same (X0, Y0) and (X1, Y1) bounds." * * The format check was made above because desktop OpenGL has the same * requirement. */ if (readFb->Visual.samples > 0 && (srcX0 != dstX0 || srcY0 != dstY0 || srcX1 != dstX1 || srcY1 != dstY1)) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebuffer(bad src/dst multisample region)"); return; } } else { if (readFb->Visual.samples > 0 && drawFb->Visual.samples > 0 && readFb->Visual.samples != drawFb->Visual.samples) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebufferEXT(mismatched samples)"); return; } /* extra checks for multisample copies... */ if ((readFb->Visual.samples > 0 || drawFb->Visual.samples > 0) && (filter == GL_NEAREST || filter == GL_LINEAR)) { /* src and dest region sizes must be the same */ if (abs(srcX1 - srcX0) != abs(dstX1 - dstX0) || abs(srcY1 - srcY0) != abs(dstY1 - dstY0)) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebufferEXT(bad src/dst multisample region sizes)"); return; } } } /* Debug code */ if (DEBUG_BLIT) { const struct gl_renderbuffer *colorReadRb = readFb->_ColorReadBuffer; const struct gl_renderbuffer *colorDrawRb = NULL; GLuint i = 0; printf("glBlitFramebuffer(%d, %d, %d, %d, %d, %d, %d, %d," " 0x%x, 0x%x)\n", srcX0, srcY0, srcX1, srcY1, dstX0, dstY0, dstX1, dstY1, mask, filter); if (colorReadRb) { const struct gl_renderbuffer_attachment *att; att = find_attachment(readFb, colorReadRb); printf(" Src FBO %u RB %u (%dx%d) ", readFb->Name, colorReadRb->Name, colorReadRb->Width, colorReadRb->Height); if (att && att->Texture) { printf("Tex %u tgt 0x%x level %u face %u", att->Texture->Name, att->Texture->Target, att->TextureLevel, att->CubeMapFace); } printf("\n"); /* Print all active color render buffers */ for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) { colorDrawRb = ctx->DrawBuffer->_ColorDrawBuffers[i]; if (!colorDrawRb) continue; att = find_attachment(drawFb, colorDrawRb); printf(" Dst FBO %u RB %u (%dx%d) ", drawFb->Name, colorDrawRb->Name, colorDrawRb->Width, colorDrawRb->Height); if (att && att->Texture) { printf("Tex %u tgt 0x%x level %u face %u", att->Texture->Name, att->Texture->Target, att->TextureLevel, att->CubeMapFace); } printf("\n"); } } } if (!mask || (srcX1 - srcX0) == 0 || (srcY1 - srcY0) == 0 || (dstX1 - dstX0) == 0 || (dstY1 - dstY0) == 0) { return; } ASSERT(ctx->Driver.BlitFramebuffer); ctx->Driver.BlitFramebuffer(ctx, srcX0, srcY0, srcX1, srcY1, dstX0, dstY0, dstX1, dstY1, mask, filter); }