Move GL-specific source code to make room for D3D back end.

git-svn-id: http://skia.googlecode.com/svn/trunk@3165 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 527 insertions, 0 deletions

diff --git a/src/gpu/gl/GrGLInterface.cpp b/src/gpu/gl/GrGLInterface.cpp
new file mode 100644
index 0000000000..c1ac088b5f
--- /dev/null
+++ b/src/gpu/gl/GrGLInterface.cpp
@@ -0,0 +1,527 @@
+
+/*
+ * 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 "GrTypes.h"
+#include "GrGLInterface.h"
+#include "GrGLDefines.h"
+
+#include <stdio.h>
+
+#if GR_GL_PER_GL_FUNC_CALLBACK
+namespace {
+void GrGLDefaultInterfaceCallback(const GrGLInterface*) {}
+}
+#endif
+
+GrGLBinding GrGLGetBindingInUseFromString(const char* versionString) {
+    if (NULL == versionString) {
+        GrAssert(!"NULL GL version string.");
+        return kNone_GrGLBinding;
+    }
+
+    int major, minor;
+
+    // check for desktop
+    int n = sscanf(versionString, "%d.%d", &major, &minor);
+    if (2 == n) {
+        return kDesktop_GrGLBinding;
+    }
+
+    // check for ES 1
+    char profile[2];
+    n = sscanf(versionString, "OpenGL ES-%c%c %d.%d", profile, profile+1,
+               &major, &minor);
+    if (4 == n) {
+        // we no longer support ES1.
+        return kNone_GrGLBinding;
+    }
+
+    // check for ES2
+    n = sscanf(versionString, "OpenGL ES %d.%d", &major, &minor);
+    if (2 == n) {
+        return kES2_GrGLBinding;
+    }
+    return kNone_GrGLBinding;
+}
+
+GrGLVersion GrGLGetVersionFromString(const char* versionString) {
+    if (NULL == versionString) {
+        GrAssert(!"NULL GL version string.");
+        return 0;
+    }
+
+    int major, minor;
+
+    int n = sscanf(versionString, "%d.%d", &major, &minor);
+    if (2 == n) {
+        return GR_GL_VER(major, minor);
+    }
+
+    char profile[2];
+    n = sscanf(versionString, "OpenGL ES-%c%c %d.%d", profile, profile+1,
+               &major, &minor);
+    if (4 == n) {
+        return GR_GL_VER(major, minor);
+    }
+    
+    n = sscanf(versionString, "OpenGL ES %d.%d", &major, &minor);
+    if (2 == n) {
+        return GR_GL_VER(major, minor);
+    }
+
+    return 0;
+}
+
+GrGLSLVersion GrGLGetGLSLVersionFromString(const char* versionString) {
+    if (NULL == versionString) {
+        GrAssert(!"NULL GLSL version string.");
+        return 0;
+    }
+
+    int major, minor;
+
+    int n = sscanf(versionString, "%d.%d", &major, &minor);
+    if (2 == n) {
+        return GR_GLSL_VER(major, minor);
+    }
+    
+    n = sscanf(versionString, "OpenGL ES GLSL ES %d.%d", &major, &minor);
+    if (2 == n) {
+        return GR_GLSL_VER(major, minor);
+    }
+    return 0;
+}
+
+bool GrGLHasExtensionFromString(const char* ext, const char* extensionString) {
+    int extLength = strlen(ext);
+
+    while (true) {
+        int n = strcspn(extensionString, " ");
+        if (n == extLength && 0 == strncmp(ext, extensionString, n)) {
+            return true;
+        }
+        if (0 == extensionString[n]) {
+            return false;
+        }
+        extensionString += n+1;
+    }
+
+    return false;
+}
+
+bool GrGLHasExtension(const GrGLInterface* gl, const char* ext) {
+    const GrGLubyte* glstr;
+    GR_GL_CALL_RET(gl, glstr, GetString(GR_GL_EXTENSIONS));
+    return GrGLHasExtensionFromString(ext, (const char*) glstr);
+}
+
+GrGLBinding GrGLGetBindingInUse(const GrGLInterface* gl) {
+    const GrGLubyte* v;
+    GR_GL_CALL_RET(gl, v, GetString(GR_GL_VERSION));
+    return GrGLGetBindingInUseFromString((const char*) v);
+}
+
+GrGLVersion GrGLGetVersion(const GrGLInterface* gl) {
+    const GrGLubyte* v;
+    GR_GL_CALL_RET(gl, v, GetString(GR_GL_VERSION));
+    return GrGLGetVersionFromString((const char*) v);
+}
+
+GrGLSLVersion GrGLGetGLSLVersion(const GrGLInterface* gl) {
+    const GrGLubyte* v;
+    GR_GL_CALL_RET(gl, v, GetString(GR_GL_SHADING_LANGUAGE_VERSION));
+    return GrGLGetGLSLVersionFromString((const char*) v);
+}
+
+GrGLInterface::GrGLInterface() {
+    fBindingsExported = kNone_GrGLBinding;
+
+    fActiveTexture = NULL;
+    fAttachShader = NULL;
+    fBeginQuery = NULL;
+    fBindAttribLocation = NULL;
+    fBindBuffer = NULL;
+    fBindFragDataLocation = NULL;
+    fBindTexture = NULL;
+    fBlendColor = NULL;
+    fBlendFunc = NULL;
+    fBufferData = NULL;
+    fBufferSubData = NULL;
+    fClear = NULL;
+    fClearColor = NULL;
+    fClearStencil = NULL;
+    fColorMask = NULL;
+    fColorPointer = NULL;
+    fCompileShader = NULL;
+    fCompressedTexImage2D = NULL;
+    fCreateProgram = NULL;
+    fCreateShader = NULL;
+    fCullFace = NULL;
+    fDeleteBuffers = NULL;
+    fDeleteProgram = NULL;
+    fDeleteQueries = NULL;
+    fDeleteShader = NULL;
+    fDeleteTextures = NULL;
+    fDepthMask = NULL;
+    fDisable = NULL;
+    fDisableVertexAttribArray = NULL;
+    fDrawArrays = NULL;
+    fDrawBuffer = NULL;
+    fDrawBuffers = NULL;
+    fDrawElements = NULL;
+    fEndQuery = NULL;
+    fFinish = NULL;
+    fFlush = NULL;
+    fEnable = NULL;
+    fEnableVertexAttribArray = NULL;
+    fFrontFace = NULL;
+    fGenBuffers = NULL;
+    fGenQueries = NULL;
+    fGenTextures = NULL;
+    fGetBufferParameteriv = NULL;
+    fGetError = NULL;
+    fGetIntegerv = NULL;
+    fGetQueryiv = NULL;
+    fGetQueryObjecti64v = NULL;
+    fGetQueryObjectiv = NULL;
+    fGetQueryObjectui64v = NULL;
+    fGetQueryObjectuiv = NULL;
+    fGetProgramInfoLog = NULL;
+    fGetProgramiv = NULL;
+    fGetShaderInfoLog = NULL;
+    fGetShaderiv = NULL;
+    fGetString = NULL;
+    fGetTexLevelParameteriv = NULL;
+    fGetUniformLocation = NULL;
+    fLineWidth = NULL;
+    fLinkProgram = NULL;
+    fPixelStorei = NULL;
+    fQueryCounter = NULL;
+    fReadBuffer = NULL;
+    fReadPixels = NULL;
+    fScissor = NULL;
+    fShaderSource = NULL;
+    fStencilFunc = NULL;
+    fStencilFuncSeparate = NULL;
+    fStencilMask = NULL;
+    fStencilMaskSeparate = NULL;
+    fStencilOp = NULL;
+    fStencilOpSeparate = NULL;
+    fTexImage2D = NULL;
+    fTexParameteri = NULL;
+    fTexStorage2D = NULL;
+    fTexSubImage2D = NULL;
+    fUniform1f = NULL;
+    fUniform1i = NULL;
+    fUniform1fv = NULL;
+    fUniform1iv = NULL;
+    fUniform2f = NULL;
+    fUniform2i = NULL;
+    fUniform2fv = NULL;
+    fUniform2iv = NULL;
+    fUniform3f = NULL;
+    fUniform3i = NULL;
+    fUniform3fv = NULL;
+    fUniform3iv = NULL;
+    fUniform4f = NULL;
+    fUniform4i = NULL;
+    fUniform4fv = NULL;
+    fUniform4iv = NULL;
+    fUniformMatrix2fv = NULL;
+    fUniformMatrix3fv = NULL;
+    fUniformMatrix4fv = NULL;
+    fUseProgram = NULL;
+    fVertexAttrib4fv = NULL;
+    fVertexAttribPointer = NULL;
+    fViewport = NULL;
+    fBindFramebuffer = NULL;
+    fBindRenderbuffer = NULL;
+    fCheckFramebufferStatus = NULL;
+    fDeleteFramebuffers = NULL;
+    fDeleteRenderbuffers = NULL;
+    fFramebufferRenderbuffer = NULL;
+    fFramebufferTexture2D = NULL;
+    fGenFramebuffers = NULL;
+    fGenRenderbuffers = NULL;
+    fGetFramebufferAttachmentParameteriv = NULL;
+    fGetRenderbufferParameteriv = NULL;
+    fRenderbufferStorage = NULL;
+    fRenderbufferStorageMultisample = NULL;
+    fBlitFramebuffer = NULL;
+    fResolveMultisampleFramebuffer = NULL;
+    fMapBuffer = NULL;
+    fUnmapBuffer = NULL;
+    fBindFragDataLocationIndexed = NULL;
+
+#if GR_GL_PER_GL_FUNC_CALLBACK
+    fCallback = GrGLDefaultInterfaceCallback;
+    fCallbackData = 0;
+#endif
+}
+
+bool GrGLInterface::validate(GrGLBinding binding) const {
+
+    // kNone must be 0 so that the check we're about to do can never succeed if
+    // binding == kNone.
+    GR_STATIC_ASSERT(kNone_GrGLBinding == 0);
+
+    if (0 == (binding & fBindingsExported)) {
+        return false;
+    }
+
+    // functions that are always required
+    if (NULL == fActiveTexture ||
+        NULL == fAttachShader ||
+        NULL == fBindAttribLocation ||
+        NULL == fBindBuffer ||
+        NULL == fBindTexture ||
+        NULL == fBlendFunc ||
+        NULL == fBufferData ||
+        NULL == fBufferSubData ||
+        NULL == fClear ||
+        NULL == fClearColor ||
+        NULL == fClearStencil ||
+        NULL == fColorMask ||
+        NULL == fCompileShader ||
+        NULL == fCreateProgram ||
+        NULL == fCreateShader ||
+        NULL == fCullFace ||
+        NULL == fDeleteBuffers ||
+        NULL == fDeleteProgram ||
+        NULL == fDeleteShader ||
+        NULL == fDeleteTextures ||
+        NULL == fDepthMask ||
+        NULL == fDisable ||
+        NULL == fDisableVertexAttribArray ||
+        NULL == fDrawArrays ||
+        NULL == fDrawElements ||
+        NULL == fEnable ||
+        NULL == fEnableVertexAttribArray ||
+        NULL == fFrontFace ||
+        NULL == fGenBuffers ||
+        NULL == fGenTextures ||
+        NULL == fGetBufferParameteriv ||
+        NULL == fGetError ||
+        NULL == fGetIntegerv ||
+        NULL == fGetProgramInfoLog ||
+        NULL == fGetProgramiv ||
+        NULL == fGetShaderInfoLog ||
+        NULL == fGetShaderiv ||
+        NULL == fGetString ||
+        NULL == fGetUniformLocation ||
+        NULL == fLinkProgram ||
+        NULL == fPixelStorei ||
+        NULL == fReadPixels ||
+        NULL == fScissor ||
+        NULL == fShaderSource ||
+        NULL == fStencilFunc ||
+        NULL == fStencilMask ||
+        NULL == fStencilOp ||
+        NULL == fTexImage2D ||
+        NULL == fTexParameteri ||
+        NULL == fTexSubImage2D ||
+        NULL == fUniform1f ||
+        NULL == fUniform1i ||
+        NULL == fUniform1fv ||
+        NULL == fUniform1iv ||
+        NULL == fUniform2f ||
+        NULL == fUniform2i ||
+        NULL == fUniform2fv ||
+        NULL == fUniform2iv ||
+        NULL == fUniform3f ||
+        NULL == fUniform3i ||
+        NULL == fUniform3fv ||
+        NULL == fUniform3iv ||
+        NULL == fUniform4f ||
+        NULL == fUniform4i ||
+        NULL == fUniform4fv ||
+        NULL == fUniform4iv ||
+        NULL == fUniformMatrix2fv ||
+        NULL == fUniformMatrix3fv ||
+        NULL == fUniformMatrix4fv ||
+        NULL == fUseProgram ||
+        NULL == fVertexAttrib4fv ||
+        NULL == fVertexAttribPointer ||
+        NULL == fViewport ||
+        NULL == fBindFramebuffer ||
+        NULL == fBindRenderbuffer ||
+        NULL == fCheckFramebufferStatus ||
+        NULL == fDeleteFramebuffers ||
+        NULL == fDeleteRenderbuffers ||
+        NULL == fFinish ||
+        NULL == fFlush ||
+        NULL == fFramebufferRenderbuffer ||
+        NULL == fFramebufferTexture2D ||
+        NULL == fGetFramebufferAttachmentParameteriv ||
+        NULL == fGetRenderbufferParameteriv ||
+        NULL == fGenFramebuffers ||
+        NULL == fGenRenderbuffers ||
+        NULL == fRenderbufferStorage) {
+        return false;
+    }
+
+    const char* ext;
+    GrGLVersion glVer = GrGLGetVersion(this);
+    ext = (const char*)fGetString(GR_GL_EXTENSIONS);
+
+    // Now check that baseline ES/Desktop fns not covered above are present
+    // and that we have fn pointers for any advertised extensions that we will
+    // try to use.
+
+    // these functions are part of ES2, we assume they are available
+    // On the desktop we assume they are available if the extension
+    // is present or GL version is high enough.
+    if (kES2_GrGLBinding == binding) {
+        if (NULL == fBlendColor ||
+            NULL == fStencilFuncSeparate ||
+            NULL == fStencilMaskSeparate ||
+            NULL == fStencilOpSeparate) {
+            return false;
+        }
+    } else if (kDesktop_GrGLBinding == binding) {
+        if (glVer >= GR_GL_VER(2,0)) {
+            if (NULL == fStencilFuncSeparate ||
+                NULL == fStencilMaskSeparate ||
+                NULL == fStencilOpSeparate) {
+                return false;
+            }
+        }
+        if (glVer >= GR_GL_VER(3,0) && NULL == fBindFragDataLocation) {
+            return false;
+        }
+        if (glVer >= GR_GL_VER(2,0) ||
+            GrGLHasExtensionFromString("GL_ARB_draw_buffers", ext)) {
+            if (NULL == fDrawBuffers) {
+                return false;
+            }
+        }
+        if (glVer >= GR_GL_VER(1,4) ||
+            GrGLHasExtensionFromString("GL_EXT_blend_color", ext)) {
+            if (NULL == fBlendColor) {
+                return false;
+            }
+        }
+        if (glVer >= GR_GL_VER(1,5) ||
+            GrGLHasExtensionFromString("GL_ARB_occlusion_query", ext)) {
+            if (NULL == fGenQueries ||
+                NULL == fDeleteQueries ||
+                NULL == fBeginQuery ||
+                NULL == fEndQuery ||
+                NULL == fGetQueryiv ||
+                NULL == fGetQueryObjectiv ||
+                NULL == fGetQueryObjectuiv) {
+                return false;
+            }
+        }
+        if (glVer >= GR_GL_VER(3,3) ||
+            GrGLHasExtensionFromString("GL_ARB_timer_query", ext) ||
+            GrGLHasExtensionFromString("GL_EXT_timer_query", ext)) {
+            if (NULL == fGetQueryObjecti64v ||
+                NULL == fGetQueryObjectui64v) {
+                return false;
+            }
+        }
+        if (glVer >= GR_GL_VER(3,3) ||
+            GrGLHasExtensionFromString("GL_ARB_timer_query", ext)) {
+            if (NULL == fQueryCounter) {
+                return false;
+            }
+        }
+    }
+
+    // optional function on desktop before 1.3
+    if (kDesktop_GrGLBinding != binding ||
+        (glVer >= GR_GL_VER(1,3) ||
+        GrGLHasExtensionFromString("GL_ARB_texture_compression", ext))) {
+        if (NULL == fCompressedTexImage2D) {
+            return false;
+        }
+    }
+
+    // part of desktop GL, but not ES
+    if (kDesktop_GrGLBinding == binding &&
+        (NULL == fLineWidth ||
+         NULL == fGetTexLevelParameteriv ||
+         NULL == fDrawBuffer ||
+         NULL == fReadBuffer)) {
+        return false;
+    }
+
+    // GL_EXT_texture_storage is part of desktop 4.2
+    // There is a desktop ARB extension and an ES+desktop EXT extension
+    if (kDesktop_GrGLBinding == binding) {
+        if (glVer >= GR_GL_VER(4,2) ||
+            GrGLHasExtensionFromString("GL_ARB_texture_storage", ext) ||
+            GrGLHasExtensionFromString("GL_EXT_texture_storage", ext)) {
+            if (NULL == fTexStorage2D) {
+                return false;
+            }
+        }
+    } else if (GrGLHasExtensionFromString("GL_EXT_texture_storage", ext)) {
+        if (NULL == fTexStorage2D) {
+            return false;
+        }
+    }
+
+    // FBO MSAA
+    if (kDesktop_GrGLBinding == binding) {
+        // GL 3.0 and the ARB extension have multisample + blit
+        if (glVer >= GR_GL_VER(3,0) || GrGLHasExtensionFromString("GL_ARB_framebuffer_object", ext)) {
+            if (NULL == fRenderbufferStorageMultisample ||
+                NULL == fBlitFramebuffer) {
+                return false;
+            }
+        } else {
+            if (GrGLHasExtensionFromString("GL_EXT_framebuffer_blit", ext) &&
+                NULL == fBlitFramebuffer) {
+                return false;
+            }
+            if (GrGLHasExtensionFromString("GL_EXT_framebuffer_multisample", ext) &&
+                NULL == fRenderbufferStorageMultisample) {
+                return false;
+            }
+        }
+    } else {
+        if (GrGLHasExtensionFromString("GL_CHROMIUM_framebuffer_multisample", ext)) {
+            if (NULL == fRenderbufferStorageMultisample ||
+                NULL == fBlitFramebuffer) {
+                return false;
+            }
+        }
+        if (GrGLHasExtensionFromString("GL_APPLE_framebuffer_multisample", ext)) {
+            if (NULL == fRenderbufferStorageMultisample ||
+                NULL == fResolveMultisampleFramebuffer) {
+                return false;
+            }
+        }
+    }
+
+    // On ES buffer mapping is an extension. On Desktop
+    // buffer mapping was part of original VBO extension
+    // which we require.
+    if (kDesktop_GrGLBinding == binding || 
+        GrGLHasExtensionFromString("GL_OES_mapbuffer", ext)) {
+        if (NULL == fMapBuffer ||
+            NULL == fUnmapBuffer) {
+            return false;
+        }
+    }
+
+    // Dual source blending
+    if (kDesktop_GrGLBinding == binding &&
+        (glVer >= GR_GL_VER(3,3) || 
+         GrGLHasExtensionFromString("GL_ARB_blend_func_extended", ext))) {
+        if (NULL == fBindFragDataLocationIndexed) {
+            return false;
+        }
+    }
+
+    return true;
+}
+