read shader sources from filesystem
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5eadf6016a
commit
6c57490bdb
14
src/fragment.glsl
Normal file
14
src/fragment.glsl
Normal file
@ -0,0 +1,14 @@
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#version 120
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uniform sampler2D textures[2];
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varying float fade_factor;
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varying vec2 texcoord;
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void main()
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{
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gl_FragColor = mix(texture2D(textures[0], texcoord),
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texture2D(textures[1], texcoord),
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fade_factor
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);
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}
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149
src/main.c
149
src/main.c
@ -10,54 +10,49 @@
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#include <glad/glad.h>
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#include <GLFW/glfw3.h>
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static void * read_file(const char * filename)
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{
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int fd = open(filename, O_RDONLY);
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if (fd == -1) {
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fprintf(stderr, "open(%s): %s\n", filename, strerror(errno));
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return NULL;
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}
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off_t size = lseek(fd, 0, SEEK_END);
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if (size == (off_t)-1) {
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fprintf(stderr, "lseek(%s, SEEK_END): %s\n", filename, strerror(errno));
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return NULL;
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}
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off_t start = lseek(fd, 0, SEEK_SET);
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if (start == (off_t)-1) {
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fprintf(stderr, "lseek(%s, SEEK_SET): %s\n", filename, strerror(errno));
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return NULL;
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}
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void * buf = malloc(size+1);
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ssize_t read_size = read(fd, buf, size);
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if (read_size == -1) {
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fprintf(stderr, "read(%s): %s\n", filename, strerror(errno));
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return NULL;
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}
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((char*)buf)[read_size] = 0;
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return buf;
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}
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void framebuffer_size_callback(GLFWwindow* window, int width, int height)
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{
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glViewport(0, 0, width, height);
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}
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const char *vertexShaderSource = R"(
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#version 120
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attribute vec2 position;
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varying vec2 texcoord;
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void main()
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{
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gl_Position = vec4(position, 0.0, 1.0);
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vec2 tex = position * vec2(0.5) + vec2(0.5);
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texcoord = vec2(tex.x * 400 / 512,
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(1.0 - tex.y) * 300 / 512);
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}
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)"
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;
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const char *fragmentShaderSource = R"(
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#version 120
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uniform float fade_factor;
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uniform sampler2D textures[2];
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varying vec2 texcoord;
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void main()
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{
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gl_FragColor = mix(texture2D(textures[0], texcoord),
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texture2D(textures[1], texcoord),
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fade_factor
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);
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}
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)"
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;
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unsigned int compile_shaders()
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{
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void * vertexShaderSource = read_file("src/vertex.glsl");
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unsigned int vertexShader;
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vertexShader = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
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glShaderSource(vertexShader, 1, (const char **)&vertexShaderSource, NULL);
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glCompileShader(vertexShader);
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{
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int success;
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@ -68,10 +63,12 @@ unsigned int compile_shaders()
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printf("vertex shader compile failed:\n%s\n", infoLog);
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}
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}
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free(vertexShaderSource);
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void * fragmentShaderSource = read_file("src/fragment.glsl");
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unsigned int fragmentShader;
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fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
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glShaderSource(fragmentShader, 1, (const char **)&fragmentShaderSource, NULL);
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glCompileShader(fragmentShader);
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{
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int success;
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@ -82,6 +79,7 @@ unsigned int compile_shaders()
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printf("fragment shader compile failed:\n%s\n", infoLog);
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}
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}
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free(fragmentShaderSource);
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unsigned int shaderProgram;
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shaderProgram = glCreateProgram();
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@ -118,47 +116,16 @@ static int make_buffer(unsigned int target,
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}
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static const float vertex_buffer_data[] = {
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-1.0f, -1.0f,
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1.0f, -1.0f,
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-1.0f, 1.0f,
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1.0f, 1.0f
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-1.0f, -1.0f, 0.0f, 1.0f,
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1.0f, -1.0f, 0.0f, 1.0f,
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-1.0f, 1.0f, 0.0f, 1.0f,
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1.0f, 1.0f, 0.0f, 1.0f,
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};
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static const unsigned short element_buffer_data[] = {
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0, 1, 2, 3
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};
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static void * read_file(const char * filename)
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{
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int fd = open(filename, O_RDONLY);
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if (fd == -1) {
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fprintf(stderr, "open(%s): %s\n", filename, strerror(errno));
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return NULL;
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}
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off_t size = lseek(fd, 0, SEEK_END);
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if (size == (off_t)-1) {
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fprintf(stderr, "lseek(%s, SEEK_END): %s\n", filename, strerror(errno));
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return NULL;
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}
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off_t start = lseek(fd, 0, SEEK_SET);
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if (start == (off_t)-1) {
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fprintf(stderr, "lseek(%s, SEEK_SET): %s\n", filename, strerror(errno));
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return NULL;
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}
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void * buf = malloc(size);
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ssize_t read_size = read(fd, buf, size);
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if (read_size == -1) {
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fprintf(stderr, "read(%s): %s\n", filename, strerror(errno));
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return NULL;
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}
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return buf;
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}
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static unsigned int make_texture(const char * filename)
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{
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unsigned int texture;
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@ -188,7 +155,7 @@ static unsigned int make_texture(const char * filename)
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struct location {
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struct {
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unsigned int fade_factor;
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unsigned int time;
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unsigned int textures[2];
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} uniform;
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struct {
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@ -236,12 +203,12 @@ int main()
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struct location location;
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location.uniform.fade_factor = glGetUniformLocation(shaderProgram, "fade_factor");
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location.uniform.time = glGetUniformLocation(shaderProgram, "time");
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location.uniform.textures[0] = glGetUniformLocation(shaderProgram, "textures[0]");
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location.uniform.textures[1] = glGetUniformLocation(shaderProgram, "textures[1]");
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printf("uniforms:\n fade_factor: %u\n textures_0: %u\n textures_1: %u\n",
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location.uniform.fade_factor,
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printf("uniforms:\n time: %u\n textures_0: %u\n textures_1: %u\n",
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location.uniform.time,
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location.uniform.textures[0],
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location.uniform.textures[1]);
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@ -249,7 +216,7 @@ int main()
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printf("attributes:\n position %u\n",
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location.attrib.position);
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float fade_factor = 0;
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float time = 0;
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struct timespec last;
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struct timespec cur;
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@ -257,17 +224,23 @@ int main()
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clock_gettime(CLOCK_MONOTONIC, &last);
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while(!glfwWindowShouldClose(window)) {
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clock_gettime(CLOCK_MONOTONIC, &cur);
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uint64_t last_msec = (last.tv_sec * 1000) + (last.tv_nsec * 1e-06);
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uint64_t cur_msec = (cur.tv_sec * 1000) + (cur.tv_nsec * 1e-06);
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uint64_t dt = cur_msec - last_msec;
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time = (float)((double)dt * 0.001);
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if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
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glfwSetWindowShouldClose(window, true);
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glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
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glClearColor(0.1f, 0.1f, 0.1f, 0.1f);
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glClear(GL_COLOR_BUFFER_BIT);
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//
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// render
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//
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glUseProgram(shaderProgram);
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glUniform1f(location.uniform.fade_factor, fade_factor);
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glUniform1f(location.uniform.time, time);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, texture_0);
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@ -279,10 +252,10 @@ int main()
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glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
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glVertexAttribPointer(location.attrib.position,
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2,
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4,
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GL_FLOAT,
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GL_FALSE,
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(sizeof (float)) * 2,
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(sizeof (float)) * 4,
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(void*)0
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);
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glEnableVertexAttribArray(location.attrib.position);
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@ -298,14 +271,6 @@ int main()
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glfwSwapBuffers(window);
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glfwPollEvents();
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clock_gettime(CLOCK_MONOTONIC, &cur);
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uint64_t last_msec = (last.tv_sec * 1000) + (last.tv_nsec * 1e-06);
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uint64_t cur_msec = (cur.tv_sec * 1000) + (cur.tv_nsec * 1e-06);
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uint64_t dt = cur_msec - last_msec;
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fade_factor = sin(dt * 0.001f) * 0.5 + 0.5;
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//last = cur;
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}
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glfwTerminate();
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20
src/vertex.glsl
Normal file
20
src/vertex.glsl
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@ -0,0 +1,20 @@
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#version 120
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uniform float time;
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attribute vec4 position;
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varying float fade_factor;
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varying vec2 texcoord;
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void main()
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{
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gl_Position = position;
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vec2 tex = position.xy * vec2(0.5) + vec2(0.5);
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texcoord = vec2(tex.x * 400 / 512,
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(1.0 - tex.y) * 300 / 512);
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fade_factor = sin(time) * 0.5 + 0.5;
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}
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