134 lines
3.7 KiB
C++
134 lines
3.7 KiB
C++
#include <mbgl/shader/shader.hpp>
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#include <mbgl/platform/gl.hpp>
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#include <mbgl/util/stopwatch.hpp>
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#include <mbgl/platform/log.hpp>
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#include <cstring>
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#include <cstdlib>
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using namespace mbgl;
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Shader::Shader(const char *name_, const GLchar *vertSource, const GLchar *fragSource)
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: name(name_),
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valid(false),
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program(0) {
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util::stopwatch stopwatch("shader compilation", Event::Shader);
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GLuint vertShader;
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if (!compileShader(&vertShader, GL_VERTEX_SHADER, vertSource)) {
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Log::Error(Event::Shader, "Vertex shader failed to compile: %s", vertSource);
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return;
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}
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GLuint fragShader;
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if (!compileShader(&fragShader, GL_FRAGMENT_SHADER, fragSource)) {
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Log::Error(Event::Shader, "Fragment shader failed to compile: %s", fragSource);
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return;
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}
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program = glCreateProgram();
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// Attach shaders
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glAttachShader(program, vertShader);
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glAttachShader(program, fragShader);
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{
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// Link program
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GLint status;
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glLinkProgram(program);
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glGetProgramiv(program, GL_LINK_STATUS, &status);
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if (status == 0) {
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GLint logLength;
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glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
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if (logLength > 0) {
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GLchar *log = (GLchar *)malloc(logLength);
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glGetProgramInfoLog(program, logLength, &logLength, log);
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Log::Error(Event::Shader, "Program failed to link: %s", log);
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free(log);
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}
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glDeleteShader(vertShader);
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vertShader = 0;
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glDeleteShader(fragShader);
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fragShader = 0;
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glDeleteProgram(program);
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program = 0;
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return;
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}
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}
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{
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// Validate program
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GLint status;
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glValidateProgram(program);
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glGetProgramiv(program, GL_VALIDATE_STATUS, &status);
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if (status == 0) {
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GLint logLength;
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glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
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if (logLength > 0) {
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GLchar *log = (GLchar *)malloc(logLength);
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glGetProgramInfoLog(program, logLength, &logLength, log);
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Log::Error(Event::Shader, "Program failed to validate: %s", log);
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free(log);
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}
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glDeleteShader(vertShader);
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vertShader = 0;
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glDeleteShader(fragShader);
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fragShader = 0;
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glDeleteProgram(program);
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program = 0;
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}
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}
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// Remove the compiled shaders; they are now part of the program.
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glDetachShader(program, vertShader);
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glDeleteShader(vertShader);
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glDetachShader(program, fragShader);
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glDeleteShader(fragShader);
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valid = true;
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}
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bool Shader::compileShader(GLuint *shader, GLenum type, const GLchar *source) {
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GLint status;
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*shader = glCreateShader(type);
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const GLchar *strings[] = { source };
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const GLint lengths[] = { (GLint)strlen(source) };
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glShaderSource(*shader, 1, strings, lengths);
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glCompileShader(*shader);
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glGetShaderiv(*shader, GL_COMPILE_STATUS, &status);
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if (status == 0) {
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GLint logLength;
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glGetShaderiv(*shader, GL_INFO_LOG_LENGTH, &logLength);
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if (logLength > 0) {
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GLchar *log = (GLchar *)malloc(logLength);
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glGetShaderInfoLog(*shader, logLength, &logLength, log);
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Log::Error(Event::Shader, "Shader failed to compile: %s", log);
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free(log);
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}
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glDeleteShader(*shader);
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*shader = 0;
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return false;
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}
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return true;
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}
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Shader::~Shader() {
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if (program) {
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glDeleteProgram(program);
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program = 0;
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valid = false;
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}
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}
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