[core] move GL value objects from gl_config.hpp to gl_values.hpp

Also removes duplicate code from gl_helper.hpp by reusing the GL values that we already have anyway.

2 files changed, 286 insertions, 76 deletions

diff --git a/include/mbgl/gl/gl_helper.hpp b/include/mbgl/gl/gl_helper.hpp
index e1fb8c27c5..4f3990a434 100644
--- a/include/mbgl/gl/gl_helper.hpp
+++ b/include/mbgl/gl/gl_helper.hpp
@@ -1,89 +1,22 @@
 #ifndef MBGL_GL_GL_HELPER
 #define MBGL_GL_GL_HELPER
 
-#include <mbgl/gl/gl.hpp>
-
-#include <array>
-
-namespace {
+namespace mbgl {
+namespace gl {
 
-template <typename T, T (*Create)(), void (*Destroy)(const T&)>
+template <typename T>
 class Preserve {
 public:
-    Preserve() : data(Create()) {}
-    ~Preserve() { Destroy(data); }
+    inline Preserve() : data(T::Get()) {
+    }
+    inline ~Preserve() {
+        T::Set(data);
+    }
 
 private:
-    const T data;
+    const typename T::Type data;
 };
 
-inline bool getBlend() {
-    return glIsEnabled(GL_BLEND);
-}
-
-inline void setBlend(const bool& enabled) {
-    enabled ? MBGL_CHECK_ERROR(glEnable(GL_BLEND)) : MBGL_CHECK_ERROR(glDisable(GL_BLEND));
-}
-
-inline std::array<float, 4> getClearColor() {
-    std::array<float, 4> color;
-    MBGL_CHECK_ERROR(glGetFloatv(GL_COLOR_CLEAR_VALUE, color.data()));
-    return color;
-}
-
-inline void setClearColor(const std::array<float, 4>& color) {
-    MBGL_CHECK_ERROR(glClearColor(color[0], color[1], color[2], color[3]));
-}
-
-
-inline std::array<GLenum, 2> getBlendFunc() {
-    GLint func[2];
-    glGetIntegerv(GL_BLEND_SRC_ALPHA, &func[0]);
-    glGetIntegerv(GL_BLEND_DST_ALPHA, &func[1]);
-    return {{ static_cast<GLenum>(func[0]), static_cast<GLenum>(func[1]) }};
-}
-
-inline void setBlendFunc(const std::array<GLenum, 2>& func) {
-    MBGL_CHECK_ERROR(glBlendFunc(func[0], func[1]));
-}
-
-#ifndef GL_ES_VERSION_2_0
-inline std::array<double, 2> getPixelZoom() {
-    std::array<double, 2> zoom;
-    glGetDoublev(GL_ZOOM_X, &zoom[0]);
-    glGetDoublev(GL_ZOOM_Y, &zoom[1]);
-    return zoom;
-}
-
-inline void setPixelZoom(const std::array<double, 2>& func) {
-    MBGL_CHECK_ERROR(glPixelZoom(func[0], func[1]));
-}
-
-
-inline std::array<double, 4> getRasterPos() {
-    std::array<double, 4> pos;
-    MBGL_CHECK_ERROR(glGetDoublev(GL_CURRENT_RASTER_POSITION, pos.data()));
-    return pos;
-}
-
-inline void setRasterPos(const std::array<double, 4>& pos) {
-    MBGL_CHECK_ERROR(glRasterPos4d(pos[0], pos[1], pos[2], pos[3]));
-}
-#endif
-} // end anonymous namespace
-
-namespace mbgl {
-namespace gl {
-
-using PreserveBlend = Preserve<bool, getBlend, setBlend>;
-using PreserveClearColor = Preserve<std::array<float, 4>, getClearColor, setClearColor>;
-using PreserveBlendFunc = Preserve<std::array<GLenum, 2>, getBlendFunc, setBlendFunc>;
-
-#ifndef GL_ES_VERSION_2_0
-using PreservePixelZoom = Preserve<std::array<double, 2>, getPixelZoom, setPixelZoom>;
-using PreserveRasterPos = Preserve<std::array<double, 4>, getRasterPos, setRasterPos>;
-#endif
-
 } // namespace gl
 } // namespace mbgl
 
diff --git a/include/mbgl/gl/gl_values.hpp b/include/mbgl/gl/gl_values.hpp
new file mode 100644
index 0000000000..a5d413f5af
--- /dev/null
+++ b/include/mbgl/gl/gl_values.hpp
@@ -0,0 +1,277 @@
+#ifndef MBGL_GL_GL_VALUES
+#define MBGL_GL_GL_VALUES
+
+#include <cstdint>
+#include <tuple>
+#include <array>
+
+#include <mbgl/gl/gl.hpp>
+
+namespace mbgl {
+namespace gl {
+
+struct ClearDepth {
+    using Type = GLfloat;
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glClearDepth(value));
+    }
+    inline static Type Get() {
+        Type clearDepth;
+        MBGL_CHECK_ERROR(glGetFloatv(GL_DEPTH_CLEAR_VALUE, &clearDepth));
+        return clearDepth;
+    }
+};
+
+struct ClearColor {
+    struct Type { GLfloat r, g, b, a; };
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glClearColor(value.r, value.g, value.b, value.a));
+    }
+    inline static Type Get() {
+        GLfloat floats[4];
+        MBGL_CHECK_ERROR(glGetFloatv(GL_COLOR_CLEAR_VALUE, floats));
+        return { floats[0], floats[1], floats[2], floats[3] };
+    }
+};
+
+inline bool operator!=(const ClearColor::Type& a, const ClearColor::Type& b) {
+    return a.r != b.r || a.g != b.g || a.b != b.b || a.a != b.a;
+}
+
+struct ClearStencil {
+    using Type = GLint;
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glClearStencil(value));
+    }
+    inline static Type Get() {
+        Type clearStencil;
+        MBGL_CHECK_ERROR(glGetIntegerv(GL_STENCIL_CLEAR_VALUE, &clearStencil));
+        return clearStencil;
+    }
+};
+
+struct StencilMask {
+    using Type = GLuint;
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glStencilMask(value));
+    }
+    inline static Type Get() {
+        GLint stencilMask;
+        MBGL_CHECK_ERROR(glGetIntegerv(GL_STENCIL_WRITEMASK, &stencilMask));
+        return stencilMask;
+    }
+};
+
+struct DepthMask {
+    using Type = GLboolean;
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glDepthMask(value));
+    }
+    inline static Type Get() {
+        Type depthMask;
+        MBGL_CHECK_ERROR(glGetBooleanv(GL_DEPTH_WRITEMASK, &depthMask));
+        return depthMask;
+    }
+};
+
+struct ColorMask {
+    struct Type { bool r, g, b, a; };
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glColorMask(value.r, value.g, value.b, value.a));
+    }
+    inline static Type Get() {
+        GLboolean bools[4];
+        MBGL_CHECK_ERROR(glGetBooleanv(GL_COLOR_WRITEMASK, bools));
+        return { static_cast<bool>(bools[0]), static_cast<bool>(bools[1]),
+                 static_cast<bool>(bools[2]), static_cast<bool>(bools[3]) };
+    }
+};
+
+inline bool operator!=(const ColorMask::Type& a, const ColorMask::Type& b) {
+    return a.r != b.r || a.g != b.g || a.b != b.b || a.a != b.a;
+}
+
+struct StencilFunc {
+    struct Type { GLenum func; GLint ref; GLuint mask; };
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glStencilFunc(value.func, value.ref, value.mask));
+    }
+    inline static Type Get() {
+        GLint func, ref, mask;
+        MBGL_CHECK_ERROR(glGetIntegerv(GL_STENCIL_FUNC, &func));
+        MBGL_CHECK_ERROR(glGetIntegerv(GL_STENCIL_REF, &ref));
+        MBGL_CHECK_ERROR(glGetIntegerv(GL_STENCIL_VALUE_MASK, &mask));
+        return { static_cast<GLenum>(func), ref, static_cast<GLuint>(mask) };
+    }
+};
+
+inline bool operator!=(const StencilFunc::Type& a, const StencilFunc::Type& b) {
+    return a.func != b.func || a.ref != b.ref || a.mask != b.mask;
+}
+
+struct StencilTest {
+    using Type = bool;
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(value ? glEnable(GL_STENCIL_TEST) : glDisable(GL_STENCIL_TEST));
+    }
+    inline static Type Get() {
+        Type stencilTest;
+        MBGL_CHECK_ERROR(stencilTest = glIsEnabled(GL_STENCIL_TEST));
+        return stencilTest;
+    }
+};
+
+struct StencilOp {
+    struct Type { GLenum sfail, dpfail, dppass; };
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glStencilOp(value.sfail, value.dpfail, value.dppass));
+    }
+    inline static Type Get() {
+        GLint sfail, dpfail, dppass;
+        MBGL_CHECK_ERROR(glGetIntegerv(GL_STENCIL_FAIL, &sfail));
+        MBGL_CHECK_ERROR(glGetIntegerv(GL_STENCIL_PASS_DEPTH_FAIL, &dpfail));
+        MBGL_CHECK_ERROR(glGetIntegerv(GL_STENCIL_PASS_DEPTH_PASS, &dppass));
+        return { static_cast<GLenum>(sfail), static_cast<GLenum>(dpfail), static_cast<GLuint>(dppass) };
+    }
+};
+
+struct DepthRange {
+    struct Type { GLfloat near, far; };
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glDepthRange(value.near, value.far));
+    }
+    inline static Type Get() {
+        GLfloat floats[2];
+        MBGL_CHECK_ERROR(glGetFloatv(GL_DEPTH_RANGE, floats));
+        return { floats[0], floats[1] };
+    }
+};
+
+inline bool operator!=(const DepthRange::Type& a, const DepthRange::Type& b) {
+    return a.near != b.near || a.far != b.far;
+}
+
+struct DepthTest {
+    using Type = bool;
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(value ? glEnable(GL_DEPTH_TEST) : glDisable(GL_DEPTH_TEST));
+    }
+    inline static Type Get() {
+        Type depthTest;
+        MBGL_CHECK_ERROR(depthTest = glIsEnabled(GL_DEPTH_TEST));
+        return depthTest;
+    }
+};
+
+struct DepthFunc {
+    using Type = GLenum;
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glDepthFunc(value));
+    }
+    inline static Type Get() {
+        GLint depthFunc;
+        MBGL_CHECK_ERROR(glGetIntegerv(GL_DEPTH_FUNC, &depthFunc));
+        return depthFunc;
+    }
+};
+
+struct Blend {
+    using Type = bool;
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(value ? glEnable(GL_BLEND) : glDisable(GL_BLEND));
+    }
+    inline static Type Get() {
+        Type blend;
+        MBGL_CHECK_ERROR(blend = glIsEnabled(GL_BLEND));
+        return blend;
+    }
+};
+
+struct BlendFunc {
+    struct Type { GLenum sfactor, dfactor; };
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glBlendFunc(value.sfactor, value.dfactor));
+    }
+    inline static Type Get() {
+        GLint sfactor, dfactor;
+        MBGL_CHECK_ERROR(glGetIntegerv(GL_BLEND_SRC_ALPHA, &sfactor));
+        MBGL_CHECK_ERROR(glGetIntegerv(GL_BLEND_DST_ALPHA, &dfactor));
+        return { static_cast<GLenum>(sfactor), static_cast<GLenum>(dfactor) };
+    }
+};
+
+struct Program {
+    using Type = GLuint;
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glUseProgram(value));
+    }
+    inline static Type Get() {
+        GLint program;
+        MBGL_CHECK_ERROR(glGetIntegerv(GL_CURRENT_PROGRAM, &program));
+        return program;
+    }
+};
+
+struct LineWidth {
+    using Type = GLfloat;
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glLineWidth(value));
+    }
+    inline static Type Get() {
+        Type lineWidth;
+        MBGL_CHECK_ERROR(glGetFloatv(GL_LINE_WIDTH, &lineWidth));
+        return lineWidth;
+    }
+};
+
+#ifndef GL_ES_VERSION_2_0
+
+struct PixelZoom {
+    struct Type { GLfloat xfactor; GLfloat yfactor; };
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glPixelZoom(value.xfactor, value.yfactor));
+    }
+    inline static Type Get() {
+        Type value;
+        MBGL_CHECK_ERROR(glGetFloatv(GL_ZOOM_X, &value.xfactor));
+        MBGL_CHECK_ERROR(glGetFloatv(GL_ZOOM_Y, &value.yfactor));
+        return value;
+    }
+};
+
+struct RasterPos {
+    using Type = std::array<GLdouble, 4>;
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glRasterPos4d(value[0], value[1], value[2], value[3]));
+    }
+    inline static Type Get() {
+        Type pos;
+        MBGL_CHECK_ERROR(glGetDoublev(GL_CURRENT_RASTER_POSITION, pos.data()));
+        return pos;
+    }
+};
+
+#endif
+
+} // namespace gl
+} // namespace mbgl
+
+#endif // MBGL_RENDERER_GL_CONFIG