91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <GLFW/glfw3.h>
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#include "deps/lodepng/lodepng.h"
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void keyboard_callback(GLFWwindow *window, int key, int scancode,
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int action, int mods);
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int main(int argc, char const *argv[])
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{
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GLFWwindow *window;
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if (!glfwInit())
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return -1;
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 1);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 4);
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glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
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window = glfwCreateWindow(400, 400, "Example Lodepng", NULL, NULL);
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if (!window)
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{
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glfwTerminate();
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return -1;
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}
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glfwMakeContextCurrent(window);
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glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
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GLuint texture;
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glGenTextures(1, &texture);
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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unsigned int error;
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unsigned char *image;
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unsigned int width, height;
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const char *filename = argc > 1 ? argv[1] : "textures/Nav.png";
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error = lodepng_decode32_file(&image, &width, &height, filename);
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if (error)
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printf("Error %u: %s\n", error, lodepng_error_text(error));
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, image);
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free(image);
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while (!glfwWindowShouldClose(window))
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{
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glfwSetKeyCallback(window, keyboard_callback);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(0, 400, 400, 0, -1, 1);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glClearColor(1, 1, 1, 0);
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glClear(GL_COLOR_BUFFER_BIT);
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glBindTexture(GL_TEXTURE_2D, texture);
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glEnable(GL_TEXTURE_2D);
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
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glColor3ub(255, 235, 115);
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glBegin(GL_QUADS);
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glTexCoord2f(0, 0); glVertex2f(50, 50);
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glTexCoord2f(1, 0); glVertex2f(350, 50);
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glTexCoord2f(1, 1); glVertex2f(350, 350);
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glTexCoord2f(0, 1); glVertex2f(50, 350);
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glEnd();
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glDisable(GL_TEXTURE_2D);
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glfwSwapBuffers(window);
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glfwPollEvents();
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}
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glfwTerminate();
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return 0;
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}
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void keyboard_callback(GLFWwindow* window, int key, int scancode,
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int action, int mods)
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{
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if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
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glfwSetWindowShouldClose(window, GL_TRUE);
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}
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