Revert of rename sk_gpu_test::GLContext to sk_gpu_test::GLTestContext

tools/gpu/gl/null/NullGLContext.cpp

Index: tools/gpu/gl/null/NullGLContext.cpp
diff --git a/tools/gpu/gl/null/NullGLContext.cpp b/tools/gpu/gl/null/NullGLContext.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..4781c90e4f1b201f5326db19ec693d989c554067
--- /dev/null
+++ b/tools/gpu/gl/null/NullGLContext.cpp
@@ -0,0 +1,630 @@
+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "NullGLContext.h"
+#include "gl/GrGLTestInterface.h"
+#include "gl/GrGLDefines.h"
+#include "gl/GrGLInterface.h"
+#include "gl/GrGLTypes.h"
+#include "SkMutex.h"
+#include "SkTDArray.h"
+
+namespace {
+
+class BufferObj {
+public:
+    BufferObj(GrGLuint id) : fID(id), fDataPtr(nullptr), fSize(0), fMapped(false) {}
+    ~BufferObj() { delete[] fDataPtr; }
+
+    void allocate(GrGLsizeiptr size, const GrGLchar* dataPtr) {
+        if (fDataPtr) {
+            SkASSERT(0 != fSize);
+            delete[] fDataPtr;
+        }
+
+        fSize = size;
+        fDataPtr = new char[size];
+    }
+
+    GrGLuint id() const          { return fID; }
+    GrGLchar* dataPtr()          { return fDataPtr; }
+    GrGLsizeiptr size() const    { return fSize; }
+
+    void setMapped(bool mapped)  { fMapped = mapped; }
+    bool mapped() const          { return fMapped; }
+
+private:
+    GrGLuint     fID;
+    GrGLchar*    fDataPtr;
+    GrGLsizeiptr fSize;         // size in bytes
+    bool         fMapped;
+};
+
+// This class maintains a sparsely populated array of buffer pointers.
+class BufferManager {
+public:
+    BufferManager() : fFreeListHead(kFreeListEnd) {}
+
+    ~BufferManager() {
+        // nullptr out the entries that are really free list links rather than ptrs before deleting.
+        intptr_t curr = fFreeListHead;
+        while (kFreeListEnd != curr) {
+            intptr_t next = reinterpret_cast<intptr_t>(fBuffers[SkToS32(curr)]);
+            fBuffers[SkToS32(curr)] = nullptr;
+            curr = next;
+        }
+
+        fBuffers.deleteAll();
+    }
+
+    BufferObj* lookUp(GrGLuint id) {
+        BufferObj* buffer = fBuffers[id];
+        SkASSERT(buffer && buffer->id() == id);
+        return buffer;
+    }
+
+    BufferObj* create() {
+        GrGLuint id;
+        BufferObj* buffer;
+
+        if (kFreeListEnd == fFreeListHead) {
+            // no free slots - create a new one
+            id = fBuffers.count();
+            buffer = new BufferObj(id);
+            *fBuffers.append() = buffer;
+        } else {
+            // grab the head of the free list and advance the head to the next free slot.
+            id = static_cast<GrGLuint>(fFreeListHead);
+            fFreeListHead = reinterpret_cast<intptr_t>(fBuffers[id]);
+
+            buffer = new BufferObj(id);
+            fBuffers[id] = buffer;
+        }
+
+        return buffer;
+    }
+
+    void free(BufferObj* buffer) {
+        SkASSERT(fBuffers.count() > 0);
+
+        GrGLuint id = buffer->id();
+        delete buffer;
+
+        fBuffers[id] = reinterpret_cast<BufferObj*>(fFreeListHead);
+        fFreeListHead = id;
+    }
+
+private:
+    static const intptr_t kFreeListEnd = -1;
+    // Index of the first entry of fBuffers in the free list. Free slots in fBuffers are indices to
+    // the next free slot. The last free slot has a value of kFreeListEnd.
+    intptr_t                fFreeListHead;
+    SkTDArray<BufferObj*>   fBuffers;
+};
+
+/** Null interface implementation */
+class NullInterface : public GrGLTestInterface {
+public:
+    NullInterface()
+        : fCurrArrayBuffer(0)
+        , fCurrElementArrayBuffer(0)
+        , fCurrPixelPackBuffer(0)
+        , fCurrPixelUnpackBuffer(0)
+        , fCurrShaderID(0)
+        , fCurrGenericID(0)
+        , fCurrUniformLocation(0) {
+        this->init(kGL_GrGLStandard);
+    }
+
+    GrGLenum checkFramebufferStatus(GrGLenum target) override {
+        return GR_GL_FRAMEBUFFER_COMPLETE;
+    }
+
+    GrGLvoid genBuffers(GrGLsizei n, GrGLuint* ids) override {
+        for (int i = 0; i < n; ++i) {
+            BufferObj* buffer = fBufferManager.create();
+            ids[i] = buffer->id();
+        }
+    }
+
+    GrGLvoid bufferData(GrGLenum target, GrGLsizeiptr size, const GrGLvoid* data,
+                        GrGLenum usage) override {
+        GrGLuint id = 0;
+
+        switch (target) {
+            case GR_GL_ARRAY_BUFFER:
+                id = fCurrArrayBuffer;
+                break;
+            case GR_GL_ELEMENT_ARRAY_BUFFER:
+                id = fCurrElementArrayBuffer;
+                break;
+            case GR_GL_PIXEL_PACK_BUFFER:
+                id = fCurrPixelPackBuffer;
+                break;
+            case GR_GL_PIXEL_UNPACK_BUFFER:
+                id = fCurrPixelUnpackBuffer;
+                break;
+            default:
+                SkFAIL("Unexpected target to nullGLBufferData");
+                break;
+        }
+
+        if (id > 0) {
+            BufferObj* buffer = fBufferManager.lookUp(id);
+            buffer->allocate(size, (const GrGLchar*) data);
+        }
+    }
+
+    GrGLuint createProgram() override {
+        return ++fCurrProgramID;
+    }
+
+    GrGLuint createShader(GrGLenum type) override {
+        return ++fCurrShaderID;
+    }
+
+    GrGLvoid bindBuffer(GrGLenum target, GrGLuint buffer) override {
+        switch (target) {
+            case GR_GL_ARRAY_BUFFER:
+                fCurrArrayBuffer = buffer;
+                break;
+            case GR_GL_ELEMENT_ARRAY_BUFFER:
+                fCurrElementArrayBuffer = buffer;
+                break;
+            case GR_GL_PIXEL_PACK_BUFFER:
+                fCurrPixelPackBuffer = buffer;
+                break;
+            case GR_GL_PIXEL_UNPACK_BUFFER:
+                fCurrPixelUnpackBuffer = buffer;
+                break;
+        }
+    }
+
+    // deleting a bound buffer has the side effect of binding 0
+    GrGLvoid deleteBuffers(GrGLsizei n, const GrGLuint* ids) override {
+        for (int i = 0; i < n; ++i) {
+            if (ids[i] == fCurrArrayBuffer) {
+                fCurrArrayBuffer = 0;
+            }
+            if (ids[i] == fCurrElementArrayBuffer) {
+                fCurrElementArrayBuffer = 0;
+            }
+            if (ids[i] == fCurrPixelPackBuffer) {
+                fCurrPixelPackBuffer = 0;
+            }
+            if (ids[i] == fCurrPixelUnpackBuffer) {
+                fCurrPixelUnpackBuffer = 0;
+            }
+
+            BufferObj* buffer = fBufferManager.lookUp(ids[i]);
+            fBufferManager.free(buffer);
+        }
+    }
+
+    GrGLvoid genFramebuffers(GrGLsizei n, GrGLuint *framebuffers) override {
+        this->genGenericIds(n, framebuffers);
+    }
+
+    GrGLvoid genQueries(GrGLsizei n, GrGLuint *ids) override { this->genGenericIds(n, ids); }
+
+    GrGLvoid genRenderbuffers(GrGLsizei n, GrGLuint *renderbuffers) override {
+        this->genGenericIds(n, renderbuffers);
+    }
+
+    GrGLvoid genTextures(GrGLsizei n, GrGLuint *textures) override {
+        this->genGenericIds(n, textures);
+    }
+
+    GrGLvoid genVertexArrays(GrGLsizei n, GrGLuint *arrays) override {
+        this->genGenericIds(n, arrays);
+    }
+
+    GrGLenum getError() override { return GR_GL_NO_ERROR; }
+
+    GrGLvoid getIntegerv(GrGLenum pname, GrGLint* params) override {
+        // TODO: remove from Ganesh the #defines for gets we don't use.
+        // We would like to minimize gets overall due to performance issues
+        switch (pname) {
+            case GR_GL_CONTEXT_PROFILE_MASK:
+                *params = GR_GL_CONTEXT_COMPATIBILITY_PROFILE_BIT;
+                break;
+            case GR_GL_STENCIL_BITS:
+                *params = 8;
+                break;
+            case GR_GL_SAMPLES:
+                *params = 1;
+                break;
+            case GR_GL_FRAMEBUFFER_BINDING:
+                *params = 0;
+                break;
+            case GR_GL_VIEWPORT:
+                params[0] = 0;
+                params[1] = 0;
+                params[2] = 800;
+                params[3] = 600;
+                break;
+            case GR_GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:
+            case GR_GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS:
+            case GR_GL_MAX_TEXTURE_IMAGE_UNITS:
+            case GR_GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS:
+                *params = 8;
+                break;
+            case GR_GL_MAX_TEXTURE_COORDS:
+                *params = 8;
+                break;
+            case GR_GL_MAX_VERTEX_UNIFORM_VECTORS:
+                *params = kDefaultMaxVertexUniformVectors;
+                break;
+            case GR_GL_MAX_FRAGMENT_UNIFORM_VECTORS:
+                *params = kDefaultMaxFragmentUniformVectors;
+                break;
+            case GR_GL_MAX_FRAGMENT_UNIFORM_COMPONENTS:
+                *params = 16 * 4;
+                break;
+            case GR_GL_NUM_COMPRESSED_TEXTURE_FORMATS:
+                *params = 0;
+                break;
+            case GR_GL_COMPRESSED_TEXTURE_FORMATS:
+                break;
+            case GR_GL_MAX_TEXTURE_SIZE:
+                *params = 8192;
+                break;
+            case GR_GL_MAX_RENDERBUFFER_SIZE:
+                *params = 8192;
+                break;
+            case GR_GL_MAX_SAMPLES:
+                *params = 32;
+                break;
+            case GR_GL_MAX_VERTEX_ATTRIBS:
+                *params = kDefaultMaxVertexAttribs;
+                break;
+            case GR_GL_MAX_VARYING_VECTORS:
+                *params = kDefaultMaxVaryingVectors;
+                break;
+            case GR_GL_NUM_EXTENSIONS: {
+                GrGLint i = 0;
+                while (kExtensions[i++]);
+                *params = i;
+                break;
+            }
+            default:
+                SkFAIL("Unexpected pname to GetIntegerv");
+        }
+    }
+
+    GrGLvoid getProgramiv(GrGLuint program, GrGLenum pname, GrGLint* params) override {
+        this->getShaderOrProgramiv(program, pname, params);
+    }
+
+    GrGLvoid getProgramInfoLog(GrGLuint program, GrGLsizei bufsize, GrGLsizei* length,
+                               char* infolog) override {
+        this->getInfoLog(program, bufsize, length, infolog);
+    }
+
+    GrGLvoid getMultisamplefv(GrGLenum pname, GrGLuint index, GrGLfloat* val) override {
+        val[0] = val[1] = 0.5f;
+    }
+
+    GrGLvoid getQueryiv(GrGLenum GLtarget, GrGLenum pname, GrGLint *params) override {
+        switch (pname) {
+            case GR_GL_CURRENT_QUERY:
+                *params = 0;
+                break;
+            case GR_GL_QUERY_COUNTER_BITS:
+                *params = 32;
+                break;
+            default:
+                SkFAIL("Unexpected pname passed GetQueryiv.");
+        }
+    }
+
+    GrGLvoid getQueryObjecti64v(GrGLuint id, GrGLenum pname, GrGLint64 *params) override {
+        this->queryResult(id, pname, params);
+    }
+
+    GrGLvoid getQueryObjectiv(GrGLuint id, GrGLenum pname, GrGLint *params) override {
+        this->queryResult(id, pname, params);
+    }
+
+    GrGLvoid getQueryObjectui64v(GrGLuint id, GrGLenum pname, GrGLuint64 *params) override {
+        this->queryResult(id, pname, params);
+    }
+
+    GrGLvoid getQueryObjectuiv(GrGLuint id, GrGLenum pname, GrGLuint *params) override {
+        this->queryResult(id, pname, params);
+    }
+
+    GrGLvoid getShaderiv(GrGLuint shader, GrGLenum pname, GrGLint* params) override {
+        this->getShaderOrProgramiv(shader, pname, params);
+    }
+
+    GrGLvoid getShaderInfoLog(GrGLuint shader, GrGLsizei bufsize, GrGLsizei* length,
+                              char* infolog) override {
+        this->getInfoLog(shader, bufsize, length, infolog);
+    }
+
+    const GrGLubyte* getString(GrGLenum name) override {
+        switch (name) {
+            case GR_GL_EXTENSIONS:
+                return CombinedExtensionString();
+            case GR_GL_VERSION:
+                return (const GrGLubyte*)"4.0 Null GL";
+            case GR_GL_SHADING_LANGUAGE_VERSION:
+                return (const GrGLubyte*)"4.20.8 Null GLSL";
+            case GR_GL_VENDOR:
+                return (const GrGLubyte*)"Null Vendor";
+            case GR_GL_RENDERER:
+                return (const GrGLubyte*)"The Null (Non-)Renderer";
+            default:
+                SkFAIL("Unexpected name passed to GetString");
+                return nullptr;
+        }
+    }
+
+    const GrGLubyte* getStringi(GrGLenum name, GrGLuint i) override {
+        switch (name) {
+            case GR_GL_EXTENSIONS: {
+                GrGLint count;
+                this->getIntegerv(GR_GL_NUM_EXTENSIONS, &count);
+                if ((GrGLint)i <= count) {
+                    return (const GrGLubyte*) kExtensions[i];
+                } else {
+                    return nullptr;
+                }
+            }
+            default:
+                SkFAIL("Unexpected name passed to GetStringi");
+                return nullptr;
+        }
+    }
+
+    GrGLint getUniformLocation(GrGLuint program, const char* name) override {
+        return ++fCurrUniformLocation;
+    }
+
+    GrGLvoid* mapBufferRange(GrGLenum target, GrGLintptr offset, GrGLsizeiptr length,
+                             GrGLbitfield access) override {
+        GrGLuint id = 0;
+        switch (target) {
+            case GR_GL_ARRAY_BUFFER:
+                id = fCurrArrayBuffer;
+                break;
+            case GR_GL_ELEMENT_ARRAY_BUFFER:
+                id = fCurrElementArrayBuffer;
+                break;
+            case GR_GL_PIXEL_PACK_BUFFER:
+                id = fCurrPixelPackBuffer;
+                break;
+            case GR_GL_PIXEL_UNPACK_BUFFER:
+                id = fCurrPixelUnpackBuffer;
+                break;
+        }
+
+        if (id > 0) {
+            // We just ignore the offset and length here.
+            BufferObj* buffer = fBufferManager.lookUp(id);
+            SkASSERT(!buffer->mapped());
+            buffer->setMapped(true);
+            return buffer->dataPtr();
+        }
+        return nullptr;
+    }
+
+    GrGLvoid* mapBuffer(GrGLenum target, GrGLenum access) override {
+        GrGLuint id = 0;
+        switch (target) {
+            case GR_GL_ARRAY_BUFFER:
+                id = fCurrArrayBuffer;
+                break;
+            case GR_GL_ELEMENT_ARRAY_BUFFER:
+                id = fCurrElementArrayBuffer;
+                break;
+            case GR_GL_PIXEL_PACK_BUFFER:
+                id = fCurrPixelPackBuffer;
+                break;
+            case GR_GL_PIXEL_UNPACK_BUFFER:
+                id = fCurrPixelUnpackBuffer;
+                break;
+        }
+
+        if (id > 0) {
+            BufferObj* buffer = fBufferManager.lookUp(id);
+            SkASSERT(!buffer->mapped());
+            buffer->setMapped(true);
+            return buffer->dataPtr();
+        }
+
+        SkASSERT(false);
+        return nullptr;            // no buffer bound to target
+    }
+
+    GrGLboolean unmapBuffer(GrGLenum target) override {
+        GrGLuint id = 0;
+        switch (target) {
+            case GR_GL_ARRAY_BUFFER:
+                id = fCurrArrayBuffer;
+                break;
+            case GR_GL_ELEMENT_ARRAY_BUFFER:
+                id = fCurrElementArrayBuffer;
+                break;
+            case GR_GL_PIXEL_PACK_BUFFER:
+                id = fCurrPixelPackBuffer;
+                break;
+            case GR_GL_PIXEL_UNPACK_BUFFER:
+                id = fCurrPixelUnpackBuffer;
+                break;
+        }
+        if (id > 0) {
+            BufferObj* buffer = fBufferManager.lookUp(id);
+            SkASSERT(buffer->mapped());
+            buffer->setMapped(false);
+            return GR_GL_TRUE;
+        }
+
+        GrAlwaysAssert(false);
+        return GR_GL_FALSE; // GR_GL_INVALID_OPERATION;
+    }
+
+    GrGLvoid getBufferParameteriv(GrGLenum target, GrGLenum pname, GrGLint* params) override {
+        switch (pname) {
+            case GR_GL_BUFFER_MAPPED: {
+                *params = GR_GL_FALSE;
+                GrGLuint id = 0;
+                switch (target) {
+                    case GR_GL_ARRAY_BUFFER:
+                        id = fCurrArrayBuffer;
+                        break;
+                    case GR_GL_ELEMENT_ARRAY_BUFFER:
+                        id = fCurrElementArrayBuffer;
+                        break;
+                    case GR_GL_PIXEL_PACK_BUFFER:
+                        id = fCurrPixelPackBuffer;
+                        break;
+                    case GR_GL_PIXEL_UNPACK_BUFFER:
+                        id = fCurrPixelUnpackBuffer;
+                        break;
+                }
+                if (id > 0) {
+                    BufferObj* buffer = fBufferManager.lookUp(id);
+                    if (buffer->mapped()) {
+                        *params = GR_GL_TRUE;
+                    }
+                }
+                break; }
+            default:
+                SkFAIL("Unexpected pname to GetBufferParamateriv");
+                break;
+        }
+    };
+
+private:
+    BufferManager   fBufferManager;
+    GrGLuint        fCurrArrayBuffer;
+    GrGLuint        fCurrElementArrayBuffer;
+    GrGLuint        fCurrPixelPackBuffer;
+    GrGLuint        fCurrPixelUnpackBuffer;
+    GrGLuint        fCurrProgramID;
+    GrGLuint        fCurrShaderID;
+    GrGLuint        fCurrGenericID;
+    GrGLuint        fCurrUniformLocation;
+
+    // the OpenGLES 2.0 spec says this must be >= 128
+    static const GrGLint kDefaultMaxVertexUniformVectors = 128;
+
+    // the OpenGLES 2.0 spec says this must be >=16
+    static const GrGLint kDefaultMaxFragmentUniformVectors = 16;
+
+    // the OpenGLES 2.0 spec says this must be >= 8
+    static const GrGLint kDefaultMaxVertexAttribs = 8;
+
+    // the OpenGLES 2.0 spec says this must be >= 8
+    static const GrGLint kDefaultMaxVaryingVectors = 8;
+
+    static const char* kExtensions[];
+
+    static const GrGLubyte* CombinedExtensionString() {
+        static SkString gExtString;
+        static SkMutex gMutex;
+        gMutex.acquire();
+        if (0 == gExtString.size()) {
+            int i = 0;
+            while (kExtensions[i]) {
+                if (i > 0) {
+                    gExtString.append(" ");
+                }
+                gExtString.append(kExtensions[i]);
+                ++i;
+            }
+        }
+        gMutex.release();
+        return (const GrGLubyte*) gExtString.c_str();
+    }
+
+    GrGLvoid genGenericIds(GrGLsizei n, GrGLuint* ids) {
+        for (int i = 0; i < n; ++i) {
+            ids[i] = ++fCurrGenericID;
+        }
+    }
+
+    GrGLvoid getInfoLog(GrGLuint object, GrGLsizei bufsize, GrGLsizei* length,
+                        char* infolog) {
+        if (length) {
+            *length = 0;
+        }
+        if (bufsize > 0) {
+            *infolog = 0;
+        }
+    }
+
+    GrGLvoid getShaderOrProgramiv(GrGLuint object,  GrGLenum pname, GrGLint* params) {
+        switch (pname) {
+            case GR_GL_LINK_STATUS:  // fallthru
+            case GR_GL_COMPILE_STATUS:
+                *params = GR_GL_TRUE;
+                break;
+            case GR_GL_INFO_LOG_LENGTH:
+                *params = 0;
+                break;
+                // we don't expect any other pnames
+            default:
+                SkFAIL("Unexpected pname to GetProgramiv");
+                break;
+        }
+    }
+
+    template <typename T>
+    void queryResult(GrGLenum GLtarget, GrGLenum pname, T *params) {
+        switch (pname) {
+            case GR_GL_QUERY_RESULT_AVAILABLE:
+                *params = GR_GL_TRUE;
+                break;
+            case GR_GL_QUERY_RESULT:
+                *params = 0;
+                break;
+            default:
+                SkFAIL("Unexpected pname passed to GetQueryObject.");
+                break;
+        }
+    }
+
+    typedef GrGLTestInterface INHERITED;
+};
+
+const char* NullInterface::kExtensions[] = {
+    "GL_ARB_framebuffer_object",
+    "GL_ARB_blend_func_extended",
+    "GL_ARB_timer_query",
+    "GL_ARB_draw_buffers",
+    "GL_ARB_occlusion_query",
+    "GL_EXT_stencil_wrap",
+    nullptr, // signifies the end of the array.
+};
+
+class NullGLContext : public sk_gpu_test::GLContext {
+public:
+    NullGLContext() { this->init(new NullInterface); }
+   ~NullGLContext() override { this->teardown(); }
+
+private:    
+    void onPlatformMakeCurrent() const override {};
+    void onPlatformSwapBuffers() const override {}
+    GrGLFuncPtr onPlatformGetProcAddress(const char*) const override { return nullptr; }
+};
+}  // anonymous namespace
+
+namespace sk_gpu_test {
+GLContext* CreateNullGLContext() {
+    GLContext* ctx = new NullGLContext();
+    if (ctx->isValid()) {
+        return ctx;
+    }
+    delete ctx;
+    return nullptr;
+}
+}  // namespace sk_gpu_test
+