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64 lines
1.6 KiB
64 lines
1.6 KiB
5 years ago
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#include <stdlib.h>
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#include <stdio.h>
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#include <assert.h>
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#include <string>
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#include "glutil.h"
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static GLuint load_shader(GLenum shaderType, const char *src) {
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GLint status = 0, len = 0;
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GLuint shader = glCreateShader(shaderType);
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assert(shader != 0);
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glShaderSource(shader, 1, &src, NULL);
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glCompileShader(shader);
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glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
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if (!status) {
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glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &len);
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if (len) {
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std::string msg(len, '\0');
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glGetShaderInfoLog(shader, len, NULL, msg.data());
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fprintf(stderr, "error compiling shader:\n%s\n", msg.c_str());
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}
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assert(0);
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}
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return shader;
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}
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GLShader::GLShader(const char *vert_src, const char *frag_src) {
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GLint status = 0, len = 0;
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prog = glCreateProgram();
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assert(prog != 0);
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vert = load_shader(GL_VERTEX_SHADER, vert_src);
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frag = load_shader(GL_FRAGMENT_SHADER, frag_src);
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glAttachShader(prog, vert);
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glAttachShader(prog, frag);
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glLinkProgram(prog);
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glGetProgramiv(prog, GL_LINK_STATUS, &status);
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if (!status) {
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glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &len);
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if (len) {
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std::string msg(len, '\0');
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glGetProgramInfoLog(prog, len, NULL, msg.data());
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fprintf(stderr, "error linking program:\n%s\n", msg.c_str());
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}
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assert(0);
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}
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}
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GLShader::~GLShader() {
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glDeleteProgram(prog);
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glDeleteShader(frag);
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glDeleteShader(vert);
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}
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GLuint GLShader::getUniformLocation(const char *name) {
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auto it = uniform_loc_map.find(name);
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if (it == uniform_loc_map.end()) {
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it = uniform_loc_map.insert(it, {name, glGetUniformLocation(prog, name)});
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}
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return it->second;
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}
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