michael@0: /*
michael@0:  * Copyright 2011 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: 
michael@0: #include "gl/GrGLInterface.h"
michael@0: #include "GrGLDefines.h"
michael@0: #include "SkTDArray.h"
michael@0: #include "GrGLNoOpInterface.h"
michael@0: 
michael@0: // Functions not declared in GrGLBogusInterface.h (not common with the Debug GL interface).
michael@0: 
michael@0: namespace { // added to suppress 'no previous prototype' warning
michael@0: 
michael@0: class GrBufferObj {
michael@0: public:
michael@0:     GrBufferObj(GrGLuint id) : fID(id), fDataPtr(NULL), fSize(0), fMapped(false) {
michael@0:     }
michael@0:     ~GrBufferObj() { SkDELETE_ARRAY(fDataPtr); }
michael@0: 
michael@0:     void allocate(GrGLsizeiptr size, const GrGLchar* dataPtr) {
michael@0:         if (NULL != fDataPtr) {
michael@0:             SkASSERT(0 != fSize);
michael@0:             SkDELETE_ARRAY(fDataPtr);
michael@0:         }
michael@0: 
michael@0:         fSize = size;
michael@0:         fDataPtr = SkNEW_ARRAY(char, size);
michael@0:     }
michael@0: 
michael@0:     GrGLuint id() const          { return fID; }
michael@0:     GrGLchar* dataPtr()          { return fDataPtr; }
michael@0:     GrGLsizeiptr size() const    { return fSize; }
michael@0: 
michael@0:     void setMapped(bool mapped)  { fMapped = mapped; }
michael@0:     bool mapped() const          { return fMapped; }
michael@0: 
michael@0: private:
michael@0:     GrGLuint     fID;
michael@0:     GrGLchar*    fDataPtr;
michael@0:     GrGLsizeiptr fSize;         // size in bytes
michael@0:     bool         fMapped;
michael@0: };
michael@0: 
michael@0: // In debug builds we do asserts that ensure we agree with GL about when a buffer
michael@0: // is mapped.
michael@0: static SkTDArray<GrBufferObj*> gBuffers;  // slot 0 is reserved for head of free list
michael@0: static GrGLuint gCurrArrayBuffer;
michael@0: static GrGLuint gCurrElementArrayBuffer;
michael@0: 
michael@0: static GrBufferObj* look_up(GrGLuint id) {
michael@0:     GrBufferObj* buffer = gBuffers[id];
michael@0:     SkASSERT(NULL != buffer && buffer->id() == id);
michael@0:     return buffer;
michael@0: }
michael@0: 
michael@0: static GrBufferObj* create_buffer() {
michael@0:     if (0 == gBuffers.count()) {
michael@0:         // slot zero is reserved for the head of the free list
michael@0:         *gBuffers.append() = NULL;
michael@0:     }
michael@0: 
michael@0:     GrGLuint id;
michael@0:     GrBufferObj* buffer;
michael@0: 
michael@0:     if (NULL == gBuffers[0]) {
michael@0:         // no free slots - create a new one
michael@0:         id = gBuffers.count();
michael@0:         buffer = SkNEW_ARGS(GrBufferObj, (id));
michael@0:         gBuffers.append(1, &buffer);
michael@0:     } else {
michael@0:         // recycle a slot from the free list
michael@0:         id = SkTCast<GrGLuint>(gBuffers[0]);
michael@0:         gBuffers[0] = gBuffers[id];
michael@0: 
michael@0:         buffer = SkNEW_ARGS(GrBufferObj, (id));
michael@0:         gBuffers[id] = buffer;
michael@0:     }
michael@0: 
michael@0:     return buffer;
michael@0: }
michael@0: 
michael@0: static void delete_buffer(GrBufferObj* buffer) {
michael@0:     SkASSERT(gBuffers.count() > 0);
michael@0: 
michael@0:     GrGLuint id = buffer->id();
michael@0:     SkDELETE(buffer);
michael@0: 
michael@0:     // Add this slot to the free list
michael@0:     gBuffers[id] = gBuffers[0];
michael@0:     gBuffers[0] = SkTCast<GrBufferObj*>((const void*)(intptr_t)id);
michael@0: }
michael@0: 
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLActiveTexture(GrGLenum texture) {}
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLAttachShader(GrGLuint program, GrGLuint shader) {}
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLBeginQuery(GrGLenum target, GrGLuint id) {}
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLBindAttribLocation(GrGLuint program, GrGLuint index, const char* name) {}
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLBindTexture(GrGLenum target, GrGLuint texture) {}
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLBindVertexArray(GrGLuint id) {}
michael@0: 
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLGenBuffers(GrGLsizei n, GrGLuint* ids) {
michael@0: 
michael@0:     for (int i = 0; i < n; ++i) {
michael@0:         GrBufferObj* buffer = create_buffer();
michael@0:         ids[i] = buffer->id();
michael@0:     }
michael@0: }
michael@0: 
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLGenerateMipmap(GrGLenum target) {}
michael@0: 
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLBufferData(GrGLenum target,
michael@0:                                               GrGLsizeiptr size,
michael@0:                                               const GrGLvoid* data,
michael@0:                                               GrGLenum usage) {
michael@0:     GrGLuint id = 0;
michael@0: 
michael@0:     switch (target) {
michael@0:     case GR_GL_ARRAY_BUFFER:
michael@0:         id = gCurrArrayBuffer;
michael@0:         break;
michael@0:     case GR_GL_ELEMENT_ARRAY_BUFFER:
michael@0:         id = gCurrElementArrayBuffer;
michael@0:         break;
michael@0:     default:
michael@0:         GrCrash("Unexpected target to nullGLBufferData");
michael@0:         break;
michael@0:     }
michael@0: 
michael@0:     if (id > 0) {
michael@0:         GrBufferObj* buffer = look_up(id);
michael@0:         buffer->allocate(size, (const GrGLchar*) data);
michael@0:     }
michael@0: }
michael@0: 
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLPixelStorei(GrGLenum pname, GrGLint param) {}
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLReadPixels(GrGLint x, GrGLint y, GrGLsizei width, GrGLsizei height, GrGLenum format, GrGLenum type, GrGLvoid* pixels) {}
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLUseProgram(GrGLuint program) {}
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLViewport(GrGLint x, GrGLint y, GrGLsizei width, GrGLsizei height) {}
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLBindFramebuffer(GrGLenum target, GrGLuint framebuffer) {}
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLBindRenderbuffer(GrGLenum target, GrGLuint renderbuffer) {}
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLDeleteFramebuffers(GrGLsizei n, const GrGLuint *framebuffers) {}
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLDeleteRenderbuffers(GrGLsizei n, const GrGLuint *renderbuffers) {}
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLFramebufferRenderbuffer(GrGLenum target, GrGLenum attachment, GrGLenum renderbuffertarget, GrGLuint renderbuffer) {}
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLFramebufferTexture2D(GrGLenum target, GrGLenum attachment, GrGLenum textarget, GrGLuint texture, GrGLint level) {}
michael@0: 
michael@0: GrGLuint GR_GL_FUNCTION_TYPE nullGLCreateProgram() {
michael@0:     static GrGLuint gCurrID = 0;
michael@0:     return ++gCurrID;
michael@0: }
michael@0: 
michael@0: GrGLuint GR_GL_FUNCTION_TYPE nullGLCreateShader(GrGLenum type) {
michael@0:     static GrGLuint gCurrID = 0;
michael@0:     return ++gCurrID;
michael@0: }
michael@0: 
michael@0: // same delete used for shaders and programs
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLDelete(GrGLuint program) {
michael@0: }
michael@0: 
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLBindBuffer(GrGLenum target, GrGLuint buffer) {
michael@0:     switch (target) {
michael@0:     case GR_GL_ARRAY_BUFFER:
michael@0:         gCurrArrayBuffer = buffer;
michael@0:         break;
michael@0:     case GR_GL_ELEMENT_ARRAY_BUFFER:
michael@0:         gCurrElementArrayBuffer = buffer;
michael@0:         break;
michael@0:     }
michael@0: }
michael@0: 
michael@0: // deleting a bound buffer has the side effect of binding 0
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLDeleteBuffers(GrGLsizei n, const GrGLuint* ids) {
michael@0:     for (int i = 0; i < n; ++i) {
michael@0:         if (ids[i] == gCurrArrayBuffer) {
michael@0:             gCurrArrayBuffer = 0;
michael@0:         }
michael@0:         if (ids[i] == gCurrElementArrayBuffer) {
michael@0:             gCurrElementArrayBuffer = 0;
michael@0:         }
michael@0: 
michael@0:         GrBufferObj* buffer = look_up(ids[i]);
michael@0:         delete_buffer(buffer);
michael@0:     }
michael@0: }
michael@0: 
michael@0: GrGLvoid* GR_GL_FUNCTION_TYPE nullGLMapBuffer(GrGLenum target, GrGLenum access) {
michael@0: 
michael@0:     GrGLuint id = 0;
michael@0:     switch (target) {
michael@0:         case GR_GL_ARRAY_BUFFER:
michael@0:             id = gCurrArrayBuffer;
michael@0:             break;
michael@0:         case GR_GL_ELEMENT_ARRAY_BUFFER:
michael@0:             id = gCurrElementArrayBuffer;
michael@0:             break;
michael@0:     }
michael@0: 
michael@0:     if (id > 0) {
michael@0:         GrBufferObj* buffer = look_up(id);
michael@0:         SkASSERT(!buffer->mapped());
michael@0:         buffer->setMapped(true);
michael@0:         return buffer->dataPtr();
michael@0:     }
michael@0: 
michael@0:     SkASSERT(false);
michael@0:     return NULL;            // no buffer bound to target
michael@0: }
michael@0: 
michael@0: GrGLboolean GR_GL_FUNCTION_TYPE nullGLUnmapBuffer(GrGLenum target) {
michael@0:     GrGLuint id = 0;
michael@0:     switch (target) {
michael@0:     case GR_GL_ARRAY_BUFFER:
michael@0:         id = gCurrArrayBuffer;
michael@0:         break;
michael@0:     case GR_GL_ELEMENT_ARRAY_BUFFER:
michael@0:         id = gCurrElementArrayBuffer;
michael@0:         break;
michael@0:     }
michael@0:     if (id > 0) {
michael@0:         GrBufferObj* buffer = look_up(id);
michael@0:         SkASSERT(buffer->mapped());
michael@0:         buffer->setMapped(false);
michael@0:         return GR_GL_TRUE;
michael@0:     }
michael@0: 
michael@0:     GrAlwaysAssert(false);
michael@0:     return GR_GL_FALSE; // GR_GL_INVALID_OPERATION;
michael@0: }
michael@0: 
michael@0: GrGLvoid GR_GL_FUNCTION_TYPE nullGLGetBufferParameteriv(GrGLenum target, GrGLenum pname, GrGLint* params) {
michael@0:     switch (pname) {
michael@0:         case GR_GL_BUFFER_MAPPED: {
michael@0:             *params = GR_GL_FALSE;
michael@0:             GrGLuint id = 0;
michael@0:             switch (target) {
michael@0:                 case GR_GL_ARRAY_BUFFER:
michael@0:                     id = gCurrArrayBuffer;
michael@0:                     break;
michael@0:                 case GR_GL_ELEMENT_ARRAY_BUFFER:
michael@0:                     id = gCurrElementArrayBuffer;
michael@0:                     break;
michael@0:             }
michael@0:             if (id > 0) {
michael@0:                 GrBufferObj* buffer = look_up(id);
michael@0:                 if (buffer->mapped()) {
michael@0:                     *params = GR_GL_TRUE;
michael@0:                 }
michael@0:             }
michael@0:             break; }
michael@0:         default:
michael@0:             GrCrash("Unexpected pname to GetBufferParamateriv");
michael@0:             break;
michael@0:     }
michael@0: };
michael@0: 
michael@0: } // end anonymous namespace
michael@0: 
michael@0: const GrGLInterface* GrGLCreateNullInterface() {
michael@0:     GrGLInterface* interface = SkNEW(GrGLInterface);
michael@0: 
michael@0:     interface->fStandard = kGL_GrGLStandard;
michael@0: 
michael@0:     GrGLInterface::Functions* functions = &interface->fFunctions;
michael@0:     functions->fActiveTexture = nullGLActiveTexture;
michael@0:     functions->fAttachShader = nullGLAttachShader;
michael@0:     functions->fBeginQuery = nullGLBeginQuery;
michael@0:     functions->fBindAttribLocation = nullGLBindAttribLocation;
michael@0:     functions->fBindBuffer = nullGLBindBuffer;
michael@0:     functions->fBindFragDataLocation = noOpGLBindFragDataLocation;
michael@0:     functions->fBindTexture = nullGLBindTexture;
michael@0:     functions->fBindVertexArray = nullGLBindVertexArray;
michael@0:     functions->fBlendColor = noOpGLBlendColor;
michael@0:     functions->fBlendFunc = noOpGLBlendFunc;
michael@0:     functions->fBufferData = nullGLBufferData;
michael@0:     functions->fBufferSubData = noOpGLBufferSubData;
michael@0:     functions->fClear = noOpGLClear;
michael@0:     functions->fClearColor = noOpGLClearColor;
michael@0:     functions->fClearStencil = noOpGLClearStencil;
michael@0:     functions->fColorMask = noOpGLColorMask;
michael@0:     functions->fCompileShader = noOpGLCompileShader;
michael@0:     functions->fCompressedTexImage2D = noOpGLCompressedTexImage2D;
michael@0:     functions->fCopyTexSubImage2D = noOpGLCopyTexSubImage2D;
michael@0:     functions->fCreateProgram = nullGLCreateProgram;
michael@0:     functions->fCreateShader = nullGLCreateShader;
michael@0:     functions->fCullFace = noOpGLCullFace;
michael@0:     functions->fDeleteBuffers = nullGLDeleteBuffers;
michael@0:     functions->fDeleteProgram = nullGLDelete;
michael@0:     functions->fDeleteQueries = noOpGLDeleteIds;
michael@0:     functions->fDeleteShader = nullGLDelete;
michael@0:     functions->fDeleteTextures = noOpGLDeleteIds;
michael@0:     functions->fDeleteVertexArrays = noOpGLDeleteIds;
michael@0:     functions->fDepthMask = noOpGLDepthMask;
michael@0:     functions->fDisable = noOpGLDisable;
michael@0:     functions->fDisableVertexAttribArray = noOpGLDisableVertexAttribArray;
michael@0:     functions->fDrawArrays = noOpGLDrawArrays;
michael@0:     functions->fDrawBuffer = noOpGLDrawBuffer;
michael@0:     functions->fDrawBuffers = noOpGLDrawBuffers;
michael@0:     functions->fDrawElements = noOpGLDrawElements;
michael@0:     functions->fEnable = noOpGLEnable;
michael@0:     functions->fEnableVertexAttribArray = noOpGLEnableVertexAttribArray;
michael@0:     functions->fEndQuery = noOpGLEndQuery;
michael@0:     functions->fFinish = noOpGLFinish;
michael@0:     functions->fFlush = noOpGLFlush;
michael@0:     functions->fFrontFace = noOpGLFrontFace;
michael@0:     functions->fGenBuffers = nullGLGenBuffers;
michael@0:     functions->fGenerateMipmap = nullGLGenerateMipmap;
michael@0:     functions->fGenQueries = noOpGLGenIds;
michael@0:     functions->fGenTextures = noOpGLGenIds;
michael@0:     functions->fGenVertexArrays = noOpGLGenIds;
michael@0:     functions->fGetBufferParameteriv = nullGLGetBufferParameteriv;
michael@0:     functions->fGetError = noOpGLGetError;
michael@0:     functions->fGetIntegerv = noOpGLGetIntegerv;
michael@0:     functions->fGetQueryObjecti64v = noOpGLGetQueryObjecti64v;
michael@0:     functions->fGetQueryObjectiv = noOpGLGetQueryObjectiv;
michael@0:     functions->fGetQueryObjectui64v = noOpGLGetQueryObjectui64v;
michael@0:     functions->fGetQueryObjectuiv = noOpGLGetQueryObjectuiv;
michael@0:     functions->fGetQueryiv = noOpGLGetQueryiv;
michael@0:     functions->fGetProgramInfoLog = noOpGLGetInfoLog;
michael@0:     functions->fGetProgramiv = noOpGLGetShaderOrProgramiv;
michael@0:     functions->fGetShaderInfoLog = noOpGLGetInfoLog;
michael@0:     functions->fGetShaderiv = noOpGLGetShaderOrProgramiv;
michael@0:     functions->fGetString = noOpGLGetString;
michael@0:     functions->fGetStringi = noOpGLGetStringi;
michael@0:     functions->fGetTexLevelParameteriv = noOpGLGetTexLevelParameteriv;
michael@0:     functions->fGetUniformLocation = noOpGLGetUniformLocation;
michael@0:     functions->fInsertEventMarker = noOpGLInsertEventMarker;
michael@0:     functions->fLoadIdentity = noOpGLLoadIdentity;
michael@0:     functions->fLoadMatrixf = noOpGLLoadMatrixf;
michael@0:     functions->fLineWidth = noOpGLLineWidth;
michael@0:     functions->fLinkProgram = noOpGLLinkProgram;
michael@0:     functions->fMatrixMode = noOpGLMatrixMode;
michael@0:     functions->fPixelStorei = nullGLPixelStorei;
michael@0:     functions->fPopGroupMarker = noOpGLPopGroupMarker;
michael@0:     functions->fPushGroupMarker = noOpGLPushGroupMarker;
michael@0:     functions->fQueryCounter = noOpGLQueryCounter;
michael@0:     functions->fReadBuffer = noOpGLReadBuffer;
michael@0:     functions->fReadPixels = nullGLReadPixels;
michael@0:     functions->fScissor = noOpGLScissor;
michael@0:     functions->fShaderSource = noOpGLShaderSource;
michael@0:     functions->fStencilFunc = noOpGLStencilFunc;
michael@0:     functions->fStencilFuncSeparate = noOpGLStencilFuncSeparate;
michael@0:     functions->fStencilMask = noOpGLStencilMask;
michael@0:     functions->fStencilMaskSeparate = noOpGLStencilMaskSeparate;
michael@0:     functions->fStencilOp = noOpGLStencilOp;
michael@0:     functions->fStencilOpSeparate = noOpGLStencilOpSeparate;
michael@0:     functions->fTexGenfv = noOpGLTexGenfv;
michael@0:     functions->fTexGeni = noOpGLTexGeni;
michael@0:     functions->fTexImage2D = noOpGLTexImage2D;
michael@0:     functions->fTexParameteri = noOpGLTexParameteri;
michael@0:     functions->fTexParameteriv = noOpGLTexParameteriv;
michael@0:     functions->fTexSubImage2D = noOpGLTexSubImage2D;
michael@0:     functions->fTexStorage2D = noOpGLTexStorage2D;
michael@0:     functions->fDiscardFramebuffer = noOpGLDiscardFramebuffer;
michael@0:     functions->fUniform1f = noOpGLUniform1f;
michael@0:     functions->fUniform1i = noOpGLUniform1i;
michael@0:     functions->fUniform1fv = noOpGLUniform1fv;
michael@0:     functions->fUniform1iv = noOpGLUniform1iv;
michael@0:     functions->fUniform2f = noOpGLUniform2f;
michael@0:     functions->fUniform2i = noOpGLUniform2i;
michael@0:     functions->fUniform2fv = noOpGLUniform2fv;
michael@0:     functions->fUniform2iv = noOpGLUniform2iv;
michael@0:     functions->fUniform3f = noOpGLUniform3f;
michael@0:     functions->fUniform3i = noOpGLUniform3i;
michael@0:     functions->fUniform3fv = noOpGLUniform3fv;
michael@0:     functions->fUniform3iv = noOpGLUniform3iv;
michael@0:     functions->fUniform4f = noOpGLUniform4f;
michael@0:     functions->fUniform4i = noOpGLUniform4i;
michael@0:     functions->fUniform4fv = noOpGLUniform4fv;
michael@0:     functions->fUniform4iv = noOpGLUniform4iv;
michael@0:     functions->fUniformMatrix2fv = noOpGLUniformMatrix2fv;
michael@0:     functions->fUniformMatrix3fv = noOpGLUniformMatrix3fv;
michael@0:     functions->fUniformMatrix4fv = noOpGLUniformMatrix4fv;
michael@0:     functions->fUseProgram = nullGLUseProgram;
michael@0:     functions->fVertexAttrib4fv = noOpGLVertexAttrib4fv;
michael@0:     functions->fVertexAttribPointer = noOpGLVertexAttribPointer;
michael@0:     functions->fViewport = nullGLViewport;
michael@0:     functions->fBindFramebuffer = nullGLBindFramebuffer;
michael@0:     functions->fBindRenderbuffer = nullGLBindRenderbuffer;
michael@0:     functions->fCheckFramebufferStatus = noOpGLCheckFramebufferStatus;
michael@0:     functions->fDeleteFramebuffers = nullGLDeleteFramebuffers;
michael@0:     functions->fDeleteRenderbuffers = nullGLDeleteRenderbuffers;
michael@0:     functions->fFramebufferRenderbuffer = nullGLFramebufferRenderbuffer;
michael@0:     functions->fFramebufferTexture2D = nullGLFramebufferTexture2D;
michael@0:     functions->fGenFramebuffers = noOpGLGenIds;
michael@0:     functions->fGenRenderbuffers = noOpGLGenIds;
michael@0:     functions->fGetFramebufferAttachmentParameteriv = noOpGLGetFramebufferAttachmentParameteriv;
michael@0:     functions->fGetRenderbufferParameteriv = noOpGLGetRenderbufferParameteriv;
michael@0:     functions->fRenderbufferStorage = noOpGLRenderbufferStorage;
michael@0:     functions->fRenderbufferStorageMultisample = noOpGLRenderbufferStorageMultisample;
michael@0:     functions->fBlitFramebuffer = noOpGLBlitFramebuffer;
michael@0:     functions->fResolveMultisampleFramebuffer = noOpGLResolveMultisampleFramebuffer;
michael@0:     functions->fMapBuffer = nullGLMapBuffer;
michael@0:     functions->fUnmapBuffer = nullGLUnmapBuffer;
michael@0:     functions->fBindFragDataLocationIndexed = noOpGLBindFragDataLocationIndexed;
michael@0: 
michael@0:     interface->fExtensions.init(kGL_GrGLStandard, functions->fGetString, functions->fGetStringi,
michael@0:                                 functions->fGetIntegerv);
michael@0:     return interface;
michael@0: }