diff options
Diffstat (limited to 'main.c')
| -rw-r--r-- | main.c | 113 |
1 files changed, 64 insertions, 49 deletions
@@ -4,26 +4,37 @@ #include <glad/glad.h> #include <GLFW/glfw3.h> #include <math.h> -#include <stdlib.h> + +#ifdef __EMSCRIPTEN__ +#include <emscripten.h> +#endif #include "game.h" unsigned int SCR_WIDTH = 800; unsigned int SCR_HEIGHT = 600; +GLFWwindow* window; +unsigned int texture; +GLuint shader_program; +unsigned int VAO; + extern void key_callback(int key, int scancode, int action, int mods); extern void cursor_position_callback(int xpos, int ypos); extern void mouse_button_callback(int button, int action, int mods); extern void draw_image(decoded_image img); +uint32_t buffer[256 * 240] = {0}; + struct decoded_image canvas = { .width = 256, .height = 240, .buf_size = 256 * 240, + .buf = buffer, }; const char *vertex_shader_source = - "#version 330 core\n" + "#version 300 es\n" "layout (location = 0) in vec3 aPos;\n" "layout (location = 1) in vec3 aColor;\n" "layout (location = 2) in vec2 aTexCoord;\n" @@ -40,7 +51,8 @@ const char *vertex_shader_source = "}\n"; const char *fragment_shader_source = - "#version 330 core\n" + "#version 300 es\n" + "precision mediump float;\n" "out vec4 FragColor;\n" "\n" "in vec3 ourColor;\n" @@ -89,9 +101,47 @@ void glfw_mouse_button_callback(GLFWwindow* window, int button, int action, int mouse_button_callback(button, action, mods); } -int main() { +void loop() { + if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) + glfwSetWindowShouldClose(window, 1); + + glClearColor(0.2f, 0.3f, 0.3f, 1.0f); + glClear(GL_COLOR_BUFFER_BIT); + + draw_image(canvas); + + // bind textures on corresponding texture units + glActiveTexture(GL_TEXTURE); + glBindTexture(GL_TEXTURE_2D, texture); + + float scale_x = fmin( + (float) SCR_HEIGHT / SCR_WIDTH * (float) canvas.height / canvas.width, + 1.0 + ); + float scale_y = fmin((float) SCR_WIDTH / SCR_HEIGHT * (float) canvas.width / canvas.height, + 1.0 + ); + + float m[] = { + 2.0 * scale_x, 0.0, 0.0, 0.0, + 0.0, 2.0 * scale_y, 0.0, 0.0, + 0.0, 0.0, 1.0, 0.0, + 0.0, 0.0, 0.0, 1.0, + }; + + // render container + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, canvas.width, canvas.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, canvas.buf); + glUseProgram(shader_program); + glUniform1i(glGetUniformLocation(shader_program, "texture1"), 0); + glUniformMatrix4fv(glGetUniformLocation(shader_program, "transform"), 1, GL_FALSE, m); + glBindVertexArray(VAO); + glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0); - canvas.buf = malloc(canvas.buf_size * sizeof(int)); + glfwSwapBuffers(window); + glfwPollEvents(); +} + +int main() { glfwInit(); glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); @@ -102,7 +152,7 @@ int main() { glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); #endif - GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "202-anything", NULL, NULL); + window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "202-anything", NULL, NULL); if (window == NULL) { printf("Failed to create GLFW window\n"); glfwTerminate(); @@ -146,7 +196,7 @@ int main() { return 1; } - GLuint shader_program = glCreateProgram(); + shader_program = glCreateProgram(); glAttachShader(shader_program, vertex_shader); glAttachShader(shader_program, fragment_shader); glLinkProgram(shader_program); @@ -162,7 +212,7 @@ int main() { 0, 1, 3, // first triangle 1, 2, 3 // second triangle }; - unsigned int VBO, VAO, EBO; + unsigned int VBO, EBO; glGenVertexArrays(1, &VAO); glGenBuffers(1, &VBO); glGenBuffers(1, &EBO); @@ -185,7 +235,6 @@ int main() { glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float))); glEnableVertexAttribArray(2); - unsigned int texture; // texture 1 // --------- glGenTextures(1, &texture); @@ -202,46 +251,12 @@ int main() { glUseProgram(shader_program); glUniform1i(glGetUniformLocation(shader_program, "texture1"), 0); - while (!glfwWindowShouldClose(window)) { - if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) - glfwSetWindowShouldClose(window, 1); - - glClearColor(0.2f, 0.3f, 0.3f, 1.0f); - glClear(GL_COLOR_BUFFER_BIT); - - draw_image(canvas); - - // bind textures on corresponding texture units - glActiveTexture(GL_TEXTURE); - glBindTexture(GL_TEXTURE_2D, texture); - - float scale_x = fmin( - (float) SCR_HEIGHT / SCR_WIDTH * (float) canvas.height / canvas.width, - 1.0 - ); - float scale_y = fmin((float) SCR_WIDTH / SCR_HEIGHT * (float) canvas.width / canvas.height, - 1.0 - ); - - float m[] = { - 2.0 * scale_x, 0.0, 0.0, 0.0, - 0.0, 2.0 * scale_y, 0.0, 0.0, - 0.0, 0.0, 1.0, 0.0, - 0.0, 0.0, 0.0, 1.0, - }; - - // render container - glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, canvas.width, canvas.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, canvas.buf); - glUseProgram(shader_program); - glUniform1i(glGetUniformLocation(shader_program, "texture1"), 0); - glUniformMatrix4fv(glGetUniformLocation(shader_program, "transform"), 1, GL_FALSE, m); - - glBindVertexArray(VAO); - glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0); - - glfwSwapBuffers(window); - glfwPollEvents(); - } +#ifdef __EMSCRIPTEN__ + emscripten_set_main_loop(loop, 0, true); +#else + while (!glfwWindowShouldClose(window)) + loop(); +#endif glfwTerminate(); |