initial commit

1 files changed, 55 insertions, 0 deletions

diff --git a/src/client/render/program.cc b/src/client/render/program.cc
new file mode 100644
index 0000000..d658b68
--- /dev/null
+++ b/src/client/render/program.cc
@@ -0,0 +1,55 @@
+#include "client/render/program.hh"
+
+namespace client {
+namespace render {
+
+static void check_shader(const GLuint shader) {
+    int status = 0;
+    char info[512];
+    glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
+
+    if (!status) {
+        glGetShaderInfoLog(shader, 512, nullptr, info);
+        throw std::runtime_error(std::string("failed to compile shader: ") +
+                                 info);
+    }
+}
+
+static void check_program(const GLuint program) {
+    int status = 0;
+    char info[512];
+    glGetProgramiv(program, GL_LINK_STATUS, &status);
+
+    if (!status) {
+        glGetProgramInfoLog(program, 512, nullptr, info);
+        throw std::runtime_error(std::string("failed to link program: ") +
+                                 info);
+    }
+}
+
+program::program(const std::string_view vpath, const std::string_view fpath) {
+    const auto make_shader = [](const auto& path, const auto type) -> GLuint {
+        const std::string source = shared::read_file(path.data());
+        const char* const src_ptr = source.c_str();
+        GLuint shader = glCreateShader(type);
+        glShaderSource(shader, 1, &src_ptr, nullptr);
+        glCompileShader(shader);
+        check_shader(shader);
+        return shader;
+    };
+
+    GLuint vertex = make_shader(vpath, GL_VERTEX_SHADER);
+    GLuint fragment = make_shader(fpath, GL_FRAGMENT_SHADER);
+
+    this->index = glCreateProgram();
+    glAttachShader(this->index, vertex);
+    glAttachShader(this->index, fragment);
+    glLinkProgram(this->index);
+    check_program(this->index);
+
+    glDeleteShader(vertex);
+    glDeleteShader(fragment);
+}
+
+} // namespace render
+} // namespace client