Open source Star Ruler 2 source code!

2018-07-17 14:15:37 +02:00
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+//========================================================================
+// GLFW 3.0 - www.glfw.org
+//------------------------------------------------------------------------
+// Copyright (c) 2010 Camilla Berglund <elmindreda@elmindreda.org>
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would
+//    be appreciated but is not required.
+//
+// 2. Altered source versions must be plainly marked as such, and must not
+//    be misrepresented as being the original software.
+//
+// 3. This notice may not be removed or altered from any source
+//    distribution.
+//
+//========================================================================
+
+#include "internal.h"
+
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+
+#if defined(_MSC_VER)
+ #include <malloc.h>
+#endif
+
+
+//////////////////////////////////////////////////////////////////////////
+//////                       GLFW internal API                      //////
+//////////////////////////////////////////////////////////////////////////
+
+void _glfwAllocGammaArrays(GLFWgammaramp* ramp, unsigned int size)
+{
+    ramp->red = calloc(size, sizeof(unsigned short));
+    ramp->green = calloc(size, sizeof(unsigned short));
+    ramp->blue = calloc(size, sizeof(unsigned short));
+    ramp->size = size;
+}
+
+void _glfwFreeGammaArrays(GLFWgammaramp* ramp)
+{
+    free(ramp->red);
+    free(ramp->green);
+    free(ramp->blue);
+
+    memset(ramp, 0, sizeof(GLFWgammaramp));
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+//////                        GLFW public API                       //////
+//////////////////////////////////////////////////////////////////////////
+
+GLFWAPI void glfwSetGamma(GLFWmonitor* handle, float gamma)
+{
+    int i;
+    unsigned short values[256];
+    GLFWgammaramp ramp;
+
+    _GLFW_REQUIRE_INIT();
+
+    if (gamma <= 0.f)
+    {
+        _glfwInputError(GLFW_INVALID_VALUE,
+                        "Gamma value must be greater than zero");
+        return;
+    }
+
+    for (i = 0;  i < 256;  i++)
+    {
+        double value;
+
+        // Calculate intensity
+        value = i / 255.0;
+        // Apply gamma curve
+        value = pow(value, 1.0 / gamma) * 65535.0 + 0.5;
+
+        // Clamp to value range
+        if (value > 65535.0)
+            value = 65535.0;
+
+        values[i] = (unsigned short) value;
+    }
+
+    ramp.red = values;
+    ramp.green = values;
+    ramp.blue = values;
+    ramp.size = 256;
+
+    glfwSetGammaRamp(handle, &ramp);
+}
+
+GLFWAPI const GLFWgammaramp* glfwGetGammaRamp(GLFWmonitor* handle)
+{
+    _GLFWmonitor* monitor = (_GLFWmonitor*) handle;
+
+    _GLFW_REQUIRE_INIT_OR_RETURN(NULL);
+
+    _glfwFreeGammaArrays(&monitor->currentRamp);
+    _glfwPlatformGetGammaRamp(monitor, &monitor->currentRamp);
+
+    return &monitor->currentRamp;
+}
+
+GLFWAPI void glfwSetGammaRamp(GLFWmonitor* handle, const GLFWgammaramp* ramp)
+{
+    _GLFWmonitor* monitor = (_GLFWmonitor*) handle;
+
+    _GLFW_REQUIRE_INIT();
+
+    if (!monitor->originalRamp.size)
+        _glfwPlatformGetGammaRamp(monitor, &monitor->originalRamp);
+
+    _glfwPlatformSetGammaRamp(monitor, ramp);
+}
+