1 files changed, 133 insertions, 0 deletions
diff --git a/src/mbgl/shader/shader.cpp b/src/mbgl/shader/shader.cpp
new file mode 100644
index 0000000000..84cb55eac4
--- /dev/null
+++ b/src/mbgl/shader/shader.cpp
@@ -0,0 +1,133 @@
+#include <mbgl/shader/shader.hpp>
+#include <mbgl/platform/gl.hpp>
+#include <mbgl/util/stopwatch.hpp>
+#include <mbgl/platform/log.hpp>
+
+#include <cstring>
+#include <cstdlib>
+
+using namespace mbgl;
+
+Shader::Shader(const char *name_, const GLchar *vertSource, const GLchar *fragSource)
+    : name(name_),
+      valid(false),
+      program(0) {
+    util::stopwatch stopwatch("shader compilation", Event::Shader);
+
+    GLuint vertShader;
+    if (!compileShader(&vertShader, GL_VERTEX_SHADER, vertSource)) {
+        Log::Error(Event::Shader, "Vertex shader failed to compile: %s", vertSource);
+        return;
+    }
+
+    GLuint fragShader;
+    if (!compileShader(&fragShader, GL_FRAGMENT_SHADER, fragSource)) {
+        Log::Error(Event::Shader, "Fragment shader failed to compile: %s", fragSource);
+        return;
+    }
+
+    program = glCreateProgram();
+
+    // Attach shaders
+    glAttachShader(program, vertShader);
+    glAttachShader(program, fragShader);
+
+
+    {
+        // Link program
+        GLint status;
+        glLinkProgram(program);
+
+        glGetProgramiv(program, GL_LINK_STATUS, &status);
+        if (status == 0) {
+            GLint logLength;
+            glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
+            if (logLength > 0) {
+                GLchar *log = (GLchar *)malloc(logLength);
+                glGetProgramInfoLog(program, logLength, &logLength, log);
+                Log::Error(Event::Shader, "Program failed to link: %s", log);
+                free(log);
+            }
+
+            glDeleteShader(vertShader);
+            vertShader = 0;
+            glDeleteShader(fragShader);
+            fragShader = 0;
+            glDeleteProgram(program);
+            program = 0;
+            return;
+        }
+    }
+
+    {
+        // Validate program
+        GLint status;
+        glValidateProgram(program);
+
+        glGetProgramiv(program, GL_VALIDATE_STATUS, &status);
+        if (status == 0) {
+            GLint logLength;
+            glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
+            if (logLength > 0) {
+                GLchar *log = (GLchar *)malloc(logLength);
+                glGetProgramInfoLog(program, logLength, &logLength, log);
+                Log::Error(Event::Shader, "Program failed to validate: %s", log);
+                free(log);
+            }
+
+            glDeleteShader(vertShader);
+            vertShader = 0;
+            glDeleteShader(fragShader);
+            fragShader = 0;
+            glDeleteProgram(program);
+            program = 0;
+        }
+
+    }
+
+    // Remove the compiled shaders; they are now part of the program.
+    glDetachShader(program, vertShader);
+    glDeleteShader(vertShader);
+    glDetachShader(program, fragShader);
+    glDeleteShader(fragShader);
+
+    valid = true;
+}
+
+
+bool Shader::compileShader(GLuint *shader, GLenum type, const GLchar *source) {
+    GLint status;
+
+    *shader = glCreateShader(type);
+    const GLchar *strings[] = { source };
+    const GLint lengths[] = { (GLint)strlen(source) };
+    glShaderSource(*shader, 1, strings, lengths);
+
+    glCompileShader(*shader);
+
+    glGetShaderiv(*shader, GL_COMPILE_STATUS, &status);
+    if (status == 0) {
+        GLint logLength;
+        glGetShaderiv(*shader, GL_INFO_LOG_LENGTH, &logLength);
+        if (logLength > 0) {
+            GLchar *log = (GLchar *)malloc(logLength);
+            glGetShaderInfoLog(*shader, logLength, &logLength, log);
+            Log::Error(Event::Shader, "Shader failed to compile: %s", log);
+            free(log);
+        }
+
+        glDeleteShader(*shader);
+        *shader = 0;
+        return false;
+    }
+
+    return true;
+}
+
+Shader::~Shader() {
+    if (program) {
+        glDeleteProgram(program);
+        program = 0;
+        valid = false;
+    }
+}