[build] Move OpenGL related code to platform

Mapbox GL abstracts OpenGL with the GFX layer and OpenGL
is now optional.

3 files changed, 0 insertions, 417 deletions

diff --git a/include/mbgl/gl/renderable_resource.hpp b/include/mbgl/gl/renderable_resource.hpp
deleted file mode 100644
index 9585269270..0000000000
--- a/include/mbgl/gl/renderable_resource.hpp
+++ /dev/null
@@ -1,24 +0,0 @@
-#pragma once
-
-#include <mbgl/gfx/renderable.hpp>
-
-#include <cstdlib>
-
-namespace mbgl {
-namespace gl {
-
-class RenderableResource : public gfx::RenderableResource {
-protected:
-    explicit RenderableResource() = default;
-
-public:
-    virtual void bind() = 0;
-
-    virtual void swap() {
-        // Renderable resources that require a swap function to be called explicitly
-        // can override this method.
-    }
-};
-
-} // namespace gl
-} // namespace mbgl
diff --git a/include/mbgl/gl/renderer_backend.hpp b/include/mbgl/gl/renderer_backend.hpp
deleted file mode 100644
index cfa28ddaeb..0000000000
--- a/include/mbgl/gl/renderer_backend.hpp
+++ /dev/null
@@ -1,56 +0,0 @@
-#pragma once
-
-#include <mbgl/gfx/renderer_backend.hpp>
-#include <mbgl/util/image.hpp>
-#include <mbgl/util/size.hpp>
-#include <mbgl/util/util.hpp>
-
-namespace mbgl {
-namespace gl {
-
-class Context;
-using ProcAddress = void (*)();
-using FramebufferID = uint32_t;
-
-class RendererBackend : public gfx::RendererBackend {
-public:
-    RendererBackend(gfx::ContextMode);
-    ~RendererBackend() override;
-
-    // Called prior to rendering to update the internally assumed OpenGL state.
-    virtual void updateAssumedState() = 0;
-
-protected:
-    std::unique_ptr<gfx::Context> createContext() override;
-
-    // Called with the name of an OpenGL extension that should be loaded. RendererBackend implementations
-    // must call the API-specific version that obtains the function pointer for this function,
-    // or a null pointer if unsupported/unavailable.
-    virtual ProcAddress getExtensionFunctionPointer(const char*) = 0;
-
-    // Reads the color pixel data from the currently bound framebuffer.
-    PremultipliedImage readFramebuffer(const Size&);
-
-    // A constant to signal that a framebuffer is bound, but with an unknown ID.
-    static constexpr const FramebufferID ImplicitFramebufferBinding =
-        std::numeric_limits<FramebufferID>::max();
-
-    // Tells the renderer that OpenGL state has already been set by the windowing toolkit.
-    // It sets the internal assumed state to the supplied values.
-    void assumeFramebufferBinding(FramebufferID fbo);
-    void assumeViewport(int32_t x, int32_t y, const Size&);
-    void assumeScissorTest(bool);
-
-    // Returns true when assumed framebuffer binding hasn't changed from the implicit binding.
-    bool implicitFramebufferBound();
-
-public:
-    // Triggers an OpenGL state update if the internal assumed state doesn't match the
-    // supplied values.
-    void setFramebufferBinding(FramebufferID fbo);
-    void setViewport(int32_t x, int32_t y, const Size&);
-    void setScissorTest(bool);
-};
-
-} // namespace gl
-} // namespace mbgl
diff --git a/include/mbgl/platform/gl_functions.hpp b/include/mbgl/platform/gl_functions.hpp
deleted file mode 100644
index fab3e3aa36..0000000000
--- a/include/mbgl/platform/gl_functions.hpp
+++ /dev/null
@@ -1,337 +0,0 @@
-#pragma once
-
-#include <cstddef>
-
-// Pointers to OpenGL ES 2.0 functions. They must be
-// initialized by the platform at linking time.
-
-#ifndef NDEBUG
-#define MBGL_CHECK_ERROR(cmd) ([&]() { struct __MBGL_CHECK_ERROR { ~__MBGL_CHECK_ERROR() noexcept(false) { mbgl::platform::glCheckError(#cmd, __FILE__, __LINE__); } } __MBGL_CHECK_ERROR; return cmd; }())
-#else
-#define MBGL_CHECK_ERROR(cmd) (cmd)
-#endif
-
-namespace mbgl {
-namespace platform {
-
-using GLbitfield = unsigned int;
-using GLboolean = unsigned char;
-using GLchar = char;
-using GLdouble = double;
-using GLenum = unsigned int;
-using GLfloat = float;
-using GLint = int;
-using GLsizei = int;
-using GLubyte = unsigned char;
-using GLuint = unsigned int;
-using GLvoid = void;
-
-#if defined(_WIN32)
-using GLintptr = long long;
-using GLsizeiptr = long long;
-#else
-using GLintptr = long;
-using GLsizeiptr = long;
-#endif
-
-/// Pointer to glActiveTexture OpenGL function.
-extern void (* const glActiveTexture)(GLenum);
-/// Pointer to glAttachShader OpenGL function.
-extern void (* const glAttachShader)(GLuint, GLuint);
-/// Pointer to glBindAttribLocation OpenGL function.
-extern void (* const glBindAttribLocation)(GLuint, GLuint, const GLchar *);
-/// Pointer to glBindBuffer OpenGL function.
-extern void (* const glBindBuffer)(GLenum, GLuint);
-/// Pointer to glBindFramebuffer OpenGL function.
-extern void (* const glBindFramebuffer)(GLenum, GLuint);
-/// Pointer to glBindRenderbuffer OpenGL function.
-extern void (* const glBindRenderbuffer)(GLenum, GLuint);
-/// Pointer to glBindTexture OpenGL function.
-extern void (* const glBindTexture)(GLenum, GLuint);
-/// Pointer to glBlendColor OpenGL function.
-extern void (* const glBlendColor)(GLfloat, GLfloat, GLfloat, GLfloat);
-/// Pointer to glBlendEquation OpenGL function.
-extern void (* const glBlendEquation)(GLenum);
-/// Pointer to glBlendEquationSeparate OpenGL function.
-extern void (* const glBlendEquationSeparate)(GLenum, GLenum);
-/// Pointer to glBlendFunc OpenGL function.
-extern void (* const glBlendFunc)(GLenum, GLenum);
-/// Pointer to glBlendFuncSeparate OpenGL function.
-extern void (* const glBlendFuncSeparate)(GLenum, GLenum, GLenum, GLenum);
-/// Pointer to glBufferData OpenGL function.
-extern void (* const glBufferData)(GLenum, GLsizeiptr, const void *, GLenum);
-/// Pointer to glBufferSubData OpenGL function.
-extern void (* const glBufferSubData)(GLenum, GLintptr, GLsizeiptr, const void *);
-/// Pointer to glCheckFramebufferStatus OpenGL function.
-extern GLenum (* const glCheckFramebufferStatus)(GLenum);
-/// Pointer to glClear OpenGL function.
-extern void (* const glClear)(GLbitfield);
-/// Pointer to glClearColor OpenGL function.
-extern void (* const glClearColor)(GLfloat, GLfloat, GLfloat, GLfloat);
-/// Pointer to glClearDepthf OpenGL function.
-extern void (* const glClearDepthf)(GLfloat);
-/// Pointer to glClearStencil OpenGL function.
-extern void (* const glClearStencil)(GLint);
-/// Pointer to glColorMask OpenGL function.
-extern void (* const glColorMask)(GLboolean, GLboolean, GLboolean, GLboolean);
-/// Pointer to glCompileShader OpenGL function.
-extern void (* const glCompileShader)(GLuint);
-/// Pointer to glCompressedTexImage2D OpenGL function.
-extern void (* const glCompressedTexImage2D)(GLenum, GLint, GLenum, GLsizei, GLsizei, GLint, GLsizei, const void *);
-/// Pointer to glCompressedTexSubImage2D OpenGL function.
-extern void (* const glCompressedTexSubImage2D)(GLenum, GLint, GLint, GLint, GLsizei, GLsizei, GLenum, GLsizei, const void *);
-/// Pointer to glCopyTexImage2D OpenGL function.
-extern void (* const glCopyTexImage2D)(GLenum, GLint, GLenum, GLint, GLint, GLsizei, GLsizei, GLint);
-/// Pointer to glCopyTexSubImage2D OpenGL function.
-extern void (* const glCopyTexSubImage2D)(GLenum, GLint, GLint, GLint, GLint, GLint, GLsizei, GLsizei);
-/// Pointer to glCreateProgram OpenGL function.
-extern GLuint (* const glCreateProgram)();
-/// Pointer to glCreateShader OpenGL function.
-extern GLuint (* const glCreateShader)(GLenum);
-/// Pointer to glCullFace OpenGL function.
-extern void (* const glCullFace)(GLenum);
-/// Pointer to glDeleteBuffers OpenGL function.
-extern void (* const glDeleteBuffers)(GLsizei, const GLuint *);
-/// Pointer to glDeleteFramebuffers OpenGL function.
-extern void (* const glDeleteFramebuffers)(GLsizei, const GLuint *);
-/// Pointer to glDeleteProgram OpenGL function.
-extern void (* const glDeleteProgram)(GLuint);
-/// Pointer to glDeleteRenderbuffers OpenGL function.
-extern void (* const glDeleteRenderbuffers)(GLsizei, const GLuint *);
-/// Pointer to glDeleteShader OpenGL function.
-extern void (* const glDeleteShader)(GLuint);
-/// Pointer to glDeleteTextures OpenGL function.
-extern void (* const glDeleteTextures)(GLsizei, const GLuint *);
-/// Pointer to glDepthFunc OpenGL function.
-extern void (* const glDepthFunc)(GLenum);
-/// Pointer to glDepthMask OpenGL function.
-extern void (* const glDepthMask)(GLboolean);
-/// Pointer to glDepthRangef OpenGL function.
-extern void (* const glDepthRangef)(GLfloat, GLfloat);
-/// Pointer to glDetachShader OpenGL function.
-extern void (* const glDetachShader)(GLuint, GLuint);
-/// Pointer to glDisable OpenGL function.
-extern void (* const glDisable)(GLenum);
-/// Pointer to glDisableVertexAttribArray OpenGL function.
-extern void (* const glDisableVertexAttribArray)(GLuint);
-/// Pointer to glDrawArrays OpenGL function.
-extern void (* const glDrawArrays)(GLenum, GLint, GLsizei);
-/// Pointer to glDrawElements OpenGL function.
-extern void (* const glDrawElements)(GLenum, GLsizei, GLenum, const void *);
-/// Pointer to glEnable OpenGL function.
-extern void (* const glEnable)(GLenum);
-/// Pointer to glEnableVertexAttribArray OpenGL function.
-extern void (* const glEnableVertexAttribArray)(GLuint);
-/// Pointer to glFinish OpenGL function.
-extern void (* const glFinish)();
-/// Pointer to glFlush OpenGL function.
-extern void (* const glFlush)();
-/// Pointer to glFramebufferRenderbuffer OpenGL function.
-extern void (* const glFramebufferRenderbuffer)(GLenum, GLenum, GLenum, GLuint);
-/// Pointer to glFramebufferTexture2D OpenGL function.
-extern void (* const glFramebufferTexture2D)(GLenum, GLenum, GLenum, GLuint, GLint);
-/// Pointer to glFrontFace OpenGL function.
-extern void (* const glFrontFace)(GLenum);
-/// Pointer to glGenBuffers OpenGL function.
-extern void (* const glGenBuffers)(GLsizei, GLuint *);
-/// Pointer to glGenerateMipmap OpenGL function.
-extern void (* const glGenerateMipmap)(GLenum);
-/// Pointer to glGenFramebuffers OpenGL function.
-extern void (* const glGenFramebuffers)(GLsizei, GLuint *);
-/// Pointer to glGenRenderbuffers OpenGL function.
-extern void (* const glGenRenderbuffers)(GLsizei, GLuint *);
-/// Pointer to glGenTextures OpenGL function.
-extern void (* const glGenTextures)(GLsizei, GLuint *);
-/// Pointer to glGetActiveAttrib OpenGL function.
-extern void (* const glGetActiveAttrib)(GLuint, GLuint, GLsizei, GLsizei *, GLint *, GLenum *, GLchar *);
-/// Pointer to glGetActiveUniform OpenGL function.
-extern void (* const glGetActiveUniform)(GLuint, GLuint, GLsizei, GLsizei *, GLint *, GLenum *, GLchar *);
-/// Pointer to glGetAttachedShaders OpenGL function.
-extern void (* const glGetAttachedShaders)(GLuint, GLsizei, GLsizei *, GLuint *);
-/// Pointer to glGetAttribLocation OpenGL function.
-extern GLint (* const glGetAttribLocation)(GLuint, const GLchar *);
-/// Pointer to glGetBooleanv OpenGL function.
-extern void (* const glGetBooleanv)(GLenum, GLboolean *);
-/// Pointer to glGetBufferParameteriv OpenGL function.
-extern void (* const glGetBufferParameteriv)(GLenum, GLenum, GLint *);
-/// Pointer to glGetError OpenGL function.
-extern GLenum (* const glGetError)();
-/// Pointer to glGetFloatv OpenGL function.
-extern void (* const glGetFloatv)(GLenum, GLfloat *);
-/// Pointer to glGetFramebufferAttachmentParameteriv OpenGL function.
-extern void (* const glGetFramebufferAttachmentParameteriv)(GLenum, GLenum, GLenum, GLint *);
-/// Pointer to glGetIntegerv OpenGL function.
-extern void (* const glGetIntegerv)(GLenum, GLint *);
-/// Pointer to glGetProgramInfoLog OpenGL function.
-extern void (* const glGetProgramInfoLog)(GLuint, GLsizei, GLsizei *, GLchar *);
-/// Pointer to glGetProgramiv OpenGL function.
-extern void (* const glGetProgramiv)(GLuint, GLenum, GLint *);
-/// Pointer to glGetRenderbufferParameteriv OpenGL function.
-extern void (* const glGetRenderbufferParameteriv)(GLenum, GLenum, GLint *);
-/// Pointer to glGetShaderInfoLog OpenGL function.
-extern void (* const glGetShaderInfoLog)(GLuint, GLsizei, GLsizei *, GLchar *);
-/// Pointer to glGetShaderiv OpenGL function.
-extern void (* const glGetShaderiv)(GLuint, GLenum, GLint *);
-/// Pointer to glGetShaderSource OpenGL function.
-extern void (* const glGetShaderSource)(GLuint, GLsizei, GLsizei *, GLchar *);
-/// Pointer to glGetString OpenGL function.
-extern const GLubyte *(*glGetString)(GLenum);
-/// Pointer to glGetTexParameterfv OpenGL function.
-extern void (* const glGetTexParameterfv)(GLenum, GLenum, GLfloat *);
-/// Pointer to glGetTexParameteriv OpenGL function.
-extern void (* const glGetTexParameteriv)(GLenum, GLenum, GLint *);
-/// Pointer to glGetUniformfv OpenGL function.
-extern void (* const glGetUniformfv)(GLuint, GLint, GLfloat *);
-/// Pointer to glGetUniformiv OpenGL function.
-extern void (* const glGetUniformiv)(GLuint, GLint, GLint *);
-/// Pointer to glGetUniformLocation OpenGL function.
-extern GLint (* const glGetUniformLocation)(GLuint, const GLchar *);
-/// Pointer to glGetVertexAttribfv OpenGL function.
-extern void (* const glGetVertexAttribfv)(GLuint, GLenum, GLfloat *);
-/// Pointer to glGetVertexAttribiv OpenGL function.
-extern void (* const glGetVertexAttribiv)(GLuint, GLenum, GLint *);
-/// Pointer to glGetVertexAttribPointerv OpenGL function.
-extern void (* const glGetVertexAttribPointerv)(GLuint, GLenum, void **);
-/// Pointer to glHint OpenGL function.
-extern void (* const glHint)(GLenum, GLenum);
-/// Pointer to glIsBuffer OpenGL function.
-extern GLboolean (* const glIsBuffer)(GLuint);
-/// Pointer to glIsEnabled OpenGL function.
-extern GLboolean (* const glIsEnabled)(GLenum);
-/// Pointer to glIsFramebuffer OpenGL function.
-extern GLboolean (* const glIsFramebuffer)(GLuint);
-/// Pointer to glIsProgram OpenGL function.
-extern GLboolean (* const glIsProgram)(GLuint);
-/// Pointer to glIsRenderbuffer OpenGL function.
-extern GLboolean (* const glIsRenderbuffer)(GLuint);
-/// Pointer to glIsShader OpenGL function.
-extern GLboolean (* const glIsShader)(GLuint);
-/// Pointer to glIsTexture OpenGL function.
-extern GLboolean (* const glIsTexture)(GLuint);
-/// Pointer to glLineWidth OpenGL function.
-extern void (* const glLineWidth)(GLfloat);
-/// Pointer to glLinkProgram OpenGL function.
-extern void (* const glLinkProgram)(GLuint);
-/// Pointer to glPixelStorei OpenGL function.
-extern void (* const glPixelStorei)(GLenum, GLint);
-/// Pointer to glPolygonOffset OpenGL function.
-extern void (* const glPolygonOffset)(GLfloat, GLfloat);
-/// Pointer to glReadPixels OpenGL function.
-extern void (* const glReadPixels)(GLint, GLint, GLsizei, GLsizei, GLenum, GLenum, void *);
-/// Pointer to glRenderbufferStorage OpenGL function.
-extern void (* const glRenderbufferStorage)(GLenum, GLenum, GLsizei, GLsizei);
-/// Pointer to glSampleCoverage OpenGL function.
-extern void (* const glSampleCoverage)(GLfloat, GLboolean);
-/// Pointer to glScissor OpenGL function.
-extern void (* const glScissor)(GLint, GLint, GLsizei, GLsizei);
-/// Pointer to glShaderSource OpenGL function.
-extern void (* const glShaderSource)(GLuint, GLsizei, const GLchar * const*, const GLint *);
-/// Pointer to glStencilFunc OpenGL function.
-extern void (* const glStencilFunc)(GLenum, GLint, GLuint);
-/// Pointer to glStencilFuncSeparate OpenGL function.
-extern void (* const glStencilFuncSeparate)(GLenum, GLenum, GLint, GLuint);
-/// Pointer to glStencilMask OpenGL function.
-extern void (* const glStencilMask)(GLuint);
-/// Pointer to glStencilMaskSeparate OpenGL function.
-extern void (* const glStencilMaskSeparate)(GLenum, GLuint);
-/// Pointer to glStencilOp OpenGL function.
-extern void (* const glStencilOp)(GLenum, GLenum, GLenum);
-/// Pointer to glStencilOpSeparate OpenGL function.
-extern void (* const glStencilOpSeparate)(GLenum, GLenum, GLenum, GLenum);
-/// Pointer to glTexImage2D OpenGL function.
-extern void (* const glTexImage2D)(GLenum, GLint, GLint, GLsizei, GLsizei, GLint, GLenum, GLenum, const void *);
-/// Pointer to glTexParameterf OpenGL function.
-extern void (* const glTexParameterf)(GLenum, GLenum, GLfloat);
-/// Pointer to glTexParameterfv OpenGL function.
-extern void (* const glTexParameterfv)(GLenum, GLenum, const GLfloat *);
-/// Pointer to glTexParameteri OpenGL function.
-extern void (* const glTexParameteri)(GLenum, GLenum, GLint);
-/// Pointer to glTexParameteriv OpenGL function.
-extern void (* const glTexParameteriv)(GLenum, GLenum, const GLint *);
-/// Pointer to glTexSubImage2D OpenGL function.
-extern void (* const glTexSubImage2D)(GLenum, GLint, GLint, GLint, GLsizei, GLsizei, GLenum, GLenum, const void *);
-/// Pointer to glUniform1f OpenGL function.
-extern void (* const glUniform1f)(GLint, GLfloat);
-/// Pointer to glUniform1fv OpenGL function.
-extern void (* const glUniform1fv)(GLint, GLsizei, const GLfloat *);
-/// Pointer to glUniform1i OpenGL function.
-extern void (* const glUniform1i)(GLint, GLint);
-/// Pointer to glUniform1iv OpenGL function.
-extern void (* const glUniform1iv)(GLint, GLsizei, const GLint *);
-/// Pointer to glUniform2f OpenGL function.
-extern void (* const glUniform2f)(GLint, GLfloat, GLfloat);
-/// Pointer to glUniform2fv OpenGL function.
-extern void (* const glUniform2fv)(GLint, GLsizei, const GLfloat *);
-/// Pointer to glUniform2i OpenGL function.
-extern void (* const glUniform2i)(GLint, GLint, GLint);
-/// Pointer to glUniform2iv OpenGL function.
-extern void (* const glUniform2iv)(GLint, GLsizei, const GLint *);
-/// Pointer to glUniform3f OpenGL function.
-extern void (* const glUniform3f)(GLint, GLfloat, GLfloat, GLfloat);
-/// Pointer to glUniform3fv OpenGL function.
-extern void (* const glUniform3fv)(GLint, GLsizei, const GLfloat *);
-/// Pointer to glUniform3i OpenGL function.
-extern void (* const glUniform3i)(GLint, GLint, GLint, GLint);
-/// Pointer to glUniform3iv OpenGL function.
-extern void (* const glUniform3iv)(GLint, GLsizei, const GLint *);
-/// Pointer to glUniform4f OpenGL function.
-extern void (* const glUniform4f)(GLint, GLfloat, GLfloat, GLfloat, GLfloat);
-/// Pointer to glUniform4fv OpenGL function.
-extern void (* const glUniform4fv)(GLint, GLsizei, const GLfloat *);
-/// Pointer to glUniform4i OpenGL function.
-extern void (* const glUniform4i)(GLint, GLint, GLint, GLint, GLint);
-/// Pointer to glUniform4iv OpenGL function.
-extern void (* const glUniform4iv)(GLint, GLsizei, const GLint *);
-/// Pointer to glUniformMatrix2fv OpenGL function.
-extern void (* const glUniformMatrix2fv)(GLint, GLsizei, GLboolean, const GLfloat *);
-/// Pointer to glUniformMatrix3fv OpenGL function.
-extern void (* const glUniformMatrix3fv)(GLint, GLsizei, GLboolean, const GLfloat *);
-/// Pointer to glUniformMatrix4fv OpenGL function.
-extern void (* const glUniformMatrix4fv)(GLint, GLsizei, GLboolean, const GLfloat *);
-/// Pointer to glUseProgram OpenGL function.
-extern void (* const glUseProgram)(GLuint);
-/// Pointer to glValidateProgram OpenGL function.
-extern void (* const glValidateProgram)(GLuint);
-/// Pointer to glVertexAttrib1f OpenGL function.
-extern void (* const glVertexAttrib1f)(GLuint, GLfloat);
-/// Pointer to glVertexAttrib1fv OpenGL function.
-extern void (* const glVertexAttrib1fv)(GLuint, const GLfloat *);
-/// Pointer to glVertexAttrib2f OpenGL function.
-extern void (* const glVertexAttrib2f)(GLuint, GLfloat, GLfloat);
-/// Pointer to glVertexAttrib2fv OpenGL function.
-extern void (* const glVertexAttrib2fv)(GLuint, const GLfloat *);
-/// Pointer to glVertexAttrib3f OpenGL function.
-extern void (* const glVertexAttrib3f)(GLuint, GLfloat, GLfloat, GLfloat);
-/// Pointer to glVertexAttrib3fv OpenGL function.
-extern void (* const glVertexAttrib3fv)(GLuint, const GLfloat *);
-/// Pointer to glVertexAttrib4f OpenGL function.
-extern void (* const glVertexAttrib4f)(GLuint, GLfloat, GLfloat, GLfloat, GLfloat);
-/// Pointer to glVertexAttrib4fv OpenGL function.
-extern void (* const glVertexAttrib4fv)(GLuint, const GLfloat *);
-/// Pointer to glVertexAttribPointer OpenGL function.
-extern void (* const glVertexAttribPointer)(GLuint, GLint, GLenum, GLboolean, GLsizei, const void *);
-/// Pointer to glViewport OpenGL function.
-extern void (* const glViewport)(GLint, GLint, GLsizei, GLsizei);
-
-#ifndef MBGL_USE_GLES2
-/// Pointer to glDrawPixels OpenGL function.
-extern void (* const glDrawPixels)(GLsizei, GLsizei, GLenum, GLenum, const GLvoid *);
-/// Pointer to glGetDoublev OpenGL function.
-extern void (* const glGetDoublev)(GLenum, GLdouble *);
-/// Pointer to glPixelTransferf OpenGL function.
-extern void (* const glPixelTransferf)(GLenum, GLfloat);
-/// Pointer to glPixelZoom OpenGL function.
-extern void (* const glPixelZoom)(GLfloat, GLfloat);
-/// Pointer to glPointSize OpenGL function.
-extern void (* const glPointSize)(GLfloat);
-/// Pointer to glRasterPos4d OpenGL function.
-extern void (* const glRasterPos4d)(GLdouble, GLdouble, GLdouble, GLdouble);
-#endif
-
-#ifndef NDEBUG
-/// Check for GL errors and print on the console.
-void glCheckError(const char *cmd, const char *file, int line);
-#endif
-
-}  // namespace platform
-}  // namespace mbgl
\ No newline at end of file