145 lines
4.0 KiB
C
145 lines
4.0 KiB
C
#include <stddef.h>
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#include <stdio.h>
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#include <assert.h>
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#include "glad/glad.h"
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#include "opengl.h"
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uint compile_shader(const void * vp,
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const int vp_length,
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const void * fp,
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const int fp_length)
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{
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unsigned int vertex_shader;
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vertex_shader = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(vertex_shader, 1, (const char **)&vp, &vp_length);
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glCompileShader(vertex_shader);
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{
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int success;
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char info_log[512];
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glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &success);
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if(!success) {
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glGetShaderInfoLog(vertex_shader, 512, NULL, info_log);
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fprintf(stderr, "vertex shader compile failed:\n%s\n", info_log);
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}
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}
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unsigned int fragment_shader;
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fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(fragment_shader, 1, (const char **)&fp, &fp_length);
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glCompileShader(fragment_shader);
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{
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int success;
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char info_log[512];
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glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &success);
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if(!success) {
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glGetShaderInfoLog(fragment_shader, 512, NULL, info_log);
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fprintf(stderr, "fragment shader compile failed:\n%s\n", info_log);
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}
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}
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unsigned int shader_program;
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shader_program = glCreateProgram();
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glAttachShader(shader_program, vertex_shader);
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glAttachShader(shader_program, fragment_shader);
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glBindAttribLocation(shader_program, 0, "position");
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glLinkProgram(shader_program);
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{
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int success;
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char info_log[512];
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glGetProgramiv(shader_program, GL_LINK_STATUS, &success);
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if(!success) {
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glGetProgramInfoLog(shader_program, 512, NULL, info_log);
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fprintf(stderr, "program link failed:\n%s\n", info_log);
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}
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}
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glDeleteShader(vertex_shader);
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glDeleteShader(fragment_shader);
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return shader_program;
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}
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uint make_buffer(unsigned int target,
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const void * data,
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size_t size)
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{
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unsigned int buffer;
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glGenBuffers(1, &buffer);
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glBindBuffer(target, buffer);
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glBufferData(target, size, data, GL_STATIC_DRAW);
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glBindBuffer(target, 0);
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return buffer;
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}
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uint make_texture(const void * data,
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int internalformat,
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int width,
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int height,
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int format,
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int type)
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{
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unsigned int 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_WRAP_S, GL_CLAMP_TO_BORDER);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
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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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float color[3] = {0.0, 0.0, 0.0};
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glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, color);
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glTexImage2D(GL_TEXTURE_2D, 0, internalformat, width, height, 0, format, type, data);
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glBindTexture(GL_TEXTURE_2D, 0);
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return texture;
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}
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uint make_framebuffer(uint * texture, int length)
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{
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uint framebuffer;
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glGenFramebuffers(1, &framebuffer);
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glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
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for (int i = 0; i < length; i++) {
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i, GL_TEXTURE_2D, texture[i], 0);
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}
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GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
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//printf("glCheckFramebufferStatus: %x\n", status);
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assert(status == GL_FRAMEBUFFER_COMPLETE);
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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return framebuffer;
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}
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void debug_framebuffer(int width, int height,
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int elements,
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const char * format)
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{
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assert(elements == 1 || elements == 3);
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uint gl_format = (elements == 1) ? GL_RED : GL_RGB;
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float out[elements * width * height] = {};
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glReadPixels(0, 0,
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width, height,
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gl_format,
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GL_FLOAT,
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out);
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for (int y = 0; y < height; y++) {
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for (int x = 0; x < width; x++) {
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for (int i = 0; i < elements; i++) {
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printf(format, out[(y * width + x) * elements + i]);
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}
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}
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printf("\n");
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}
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}
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