add glfw library

1 files changed, 185 insertions, 0 deletions

diff --git a/libs/glfw-3.3.8/tests/gamma.c b/libs/glfw-3.3.8/tests/gamma.c
new file mode 100644
index 0000000..7419592
--- /dev/null
+++ b/libs/glfw-3.3.8/tests/gamma.c
@@ -0,0 +1,185 @@
+//========================================================================
+// Gamma correction test program
+// Copyright (c) Camilla Löwy <elmindreda@glfw.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.
+//
+//========================================================================
+//
+// This program is used to test the gamma correction functionality for
+// both full screen and windowed mode windows
+//
+//========================================================================
+
+#include <glad/gl.h>
+#define GLFW_INCLUDE_NONE
+#include <GLFW/glfw3.h>
+
+#define NK_IMPLEMENTATION
+#define NK_INCLUDE_FIXED_TYPES
+#define NK_INCLUDE_FONT_BAKING
+#define NK_INCLUDE_DEFAULT_FONT
+#define NK_INCLUDE_DEFAULT_ALLOCATOR
+#define NK_INCLUDE_VERTEX_BUFFER_OUTPUT
+#define NK_INCLUDE_STANDARD_VARARGS
+#define NK_BUTTON_TRIGGER_ON_RELEASE
+#include <nuklear.h>
+
+#define NK_GLFW_GL2_IMPLEMENTATION
+#include <nuklear_glfw_gl2.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static void error_callback(int error, const char* description)
+{
+    fprintf(stderr, "Error: %s\n", description);
+}
+
+static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
+{
+    if (action == GLFW_PRESS && key == GLFW_KEY_ESCAPE)
+        glfwSetWindowShouldClose(window, GLFW_TRUE);
+}
+
+static void chart_ramp_array(struct nk_context* nk,
+                             struct nk_color color,
+                             int count, unsigned short int* values)
+{
+    if (nk_chart_begin_colored(nk, NK_CHART_LINES,
+                               color, nk_rgb(255, 255, 255),
+                               count, 0, 65535))
+    {
+        int i;
+        for (i = 0;  i < count;  i++)
+        {
+            char buffer[1024];
+            if (nk_chart_push(nk, values[i]))
+            {
+                snprintf(buffer, sizeof(buffer), "#%u: %u (%0.5f) ",
+                         i, values[i], values[i] / 65535.f);
+                nk_tooltip(nk, buffer);
+            }
+        }
+
+        nk_chart_end(nk);
+    }
+}
+
+int main(int argc, char** argv)
+{
+    GLFWmonitor* monitor = NULL;
+    GLFWwindow* window;
+    GLFWgammaramp orig_ramp;
+    struct nk_context* nk;
+    struct nk_font_atlas* atlas;
+    float gamma_value = 1.f;
+
+    glfwSetErrorCallback(error_callback);
+
+    if (!glfwInit())
+        exit(EXIT_FAILURE);
+
+    monitor = glfwGetPrimaryMonitor();
+
+    glfwWindowHint(GLFW_SCALE_TO_MONITOR, GLFW_TRUE);
+
+    window = glfwCreateWindow(800, 400, "Gamma Test", NULL, NULL);
+    if (!window)
+    {
+        glfwTerminate();
+        exit(EXIT_FAILURE);
+    }
+
+    {
+        const GLFWgammaramp* ramp = glfwGetGammaRamp(monitor);
+        if (!ramp)
+        {
+            glfwTerminate();
+            exit(EXIT_FAILURE);
+        }
+
+        const size_t array_size = ramp->size * sizeof(short);
+        orig_ramp.size = ramp->size;
+        orig_ramp.red = malloc(array_size);
+        orig_ramp.green = malloc(array_size);
+        orig_ramp.blue = malloc(array_size);
+        memcpy(orig_ramp.red, ramp->red, array_size);
+        memcpy(orig_ramp.green, ramp->green, array_size);
+        memcpy(orig_ramp.blue, ramp->blue, array_size);
+    }
+
+    glfwMakeContextCurrent(window);
+    gladLoadGL(glfwGetProcAddress);
+    glfwSwapInterval(1);
+
+    nk = nk_glfw3_init(window, NK_GLFW3_INSTALL_CALLBACKS);
+    nk_glfw3_font_stash_begin(&atlas);
+    nk_glfw3_font_stash_end();
+
+    glfwSetKeyCallback(window, key_callback);
+
+    while (!glfwWindowShouldClose(window))
+    {
+        int width, height;
+        struct nk_rect area;
+
+        glfwGetWindowSize(window, &width, &height);
+        area = nk_rect(0.f, 0.f, (float) width, (float) height);
+        nk_window_set_bounds(nk, "", area);
+
+        glClear(GL_COLOR_BUFFER_BIT);
+        nk_glfw3_new_frame();
+        if (nk_begin(nk, "", area, 0))
+        {
+            const GLFWgammaramp* ramp;
+
+            nk_layout_row_dynamic(nk, 30, 3);
+            if (nk_slider_float(nk, 0.1f, &gamma_value, 5.f, 0.1f))
+                glfwSetGamma(monitor, gamma_value);
+            nk_labelf(nk, NK_TEXT_LEFT, "%0.1f", gamma_value);
+            if (nk_button_label(nk, "Revert"))
+                glfwSetGammaRamp(monitor, &orig_ramp);
+
+            ramp = glfwGetGammaRamp(monitor);
+
+            nk_layout_row_dynamic(nk, height - 60.f, 3);
+            chart_ramp_array(nk, nk_rgb(255, 0, 0), ramp->size, ramp->red);
+            chart_ramp_array(nk, nk_rgb(0, 255, 0), ramp->size, ramp->green);
+            chart_ramp_array(nk, nk_rgb(0, 0, 255), ramp->size, ramp->blue);
+        }
+
+        nk_end(nk);
+        nk_glfw3_render(NK_ANTI_ALIASING_ON);
+
+        glfwSwapBuffers(window);
+        glfwWaitEventsTimeout(1.0);
+    }
+
+    free(orig_ramp.red);
+    free(orig_ramp.green);
+    free(orig_ramp.blue);
+
+    nk_glfw3_shutdown();
+    glfwTerminate();
+    exit(EXIT_SUCCESS);
+}
+