From 354d7df4d2779ed7391701d1ef4344e959b64582 Mon Sep 17 00:00:00 2001
From: Yann Herklotz <ymherklotz@gmail.com>
Date: Wed, 27 Dec 2017 19:21:12 +0000
Subject: [Broken] Texture is black.

---
 yage/render/shader.cpp | 132 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 yage/render/shader.cpp

(limited to 'yage/render/shader.cpp')

diff --git a/yage/render/shader.cpp b/yage/render/shader.cpp
new file mode 100644
index 00000000..be2e77e2
--- /dev/null
+++ b/yage/render/shader.cpp
@@ -0,0 +1,132 @@
+/** ---------------------------------------------------------------------------
+ * @file: shader.cpp
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
+#include "shader.h"
+
+#include <fstream>
+#include <sstream>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+using std::runtime_error;
+
+namespace yage
+{
+
+Shader::Shader(const std::string &vertex_path, const std::string &fragment_path)
+{
+    std::string vertex_source, fragment_source;
+    std::ifstream vertex_file, fragment_file;
+
+    vertex_file.exceptions(std::ifstream::failbit | std::ifstream::badbit);
+    fragment_file.exceptions(std::ifstream::failbit | std::ifstream::badbit);
+
+    try {
+        vertex_file.open(vertex_path);
+        fragment_file.open(fragment_path);
+
+        std::ostringstream vertex_stream, fragment_stream;
+        vertex_stream << vertex_file.rdbuf();
+        fragment_stream << fragment_file.rdbuf();
+
+        vertex_file.close();
+        fragment_file.close();
+
+        vertex_source   = vertex_stream.str();
+        fragment_source = fragment_stream.str();
+    } catch (std::ifstream::failure e) {
+        throw runtime_error("File could not be opened: " +
+                            std::string(e.what()));
+    }
+
+    const char *vertex_source_c   = vertex_source.c_str();
+    const char *fragment_source_c = fragment_source.c_str();
+
+    GLuint vertex_shader = glCreateShader(GL_VERTEX_SHADER);
+    glShaderSource(vertex_shader, 1, &vertex_source_c, NULL);
+    glCompileShader(vertex_shader);
+    errorCheck(vertex_shader, "vertex");
+
+    GLuint fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
+    glShaderSource(fragment_shader, 1, &fragment_source_c, NULL);
+    glCompileShader(fragment_shader);
+    errorCheck(fragment_shader, "fragment");
+
+    program_id_ = glCreateProgram();
+    glAttachShader(program_id_, vertex_shader);
+    glAttachShader(program_id_, fragment_shader);
+    glLinkProgram(program_id_);
+    errorCheck(program_id_, "program");
+
+    glDetachShader(program_id_, vertex_shader);
+    glDetachShader(program_id_, fragment_shader);
+
+    glDeleteShader(vertex_shader);
+    glDeleteShader(fragment_shader);
+}
+
+Shader::~Shader()
+{
+    /// cleans up all the shaders and the program
+    if (program_id_ != 0) {
+        glDeleteProgram(program_id_);
+    }
+}
+
+void Shader::use() const
+{
+    glUseProgram(program_id_);
+}
+
+void Shader::setUniform(const std::string &name, int value) const
+{
+    glUniform1i(getUniformLocation(name), static_cast<GLint>(value));
+}
+
+void Shader::setUniform(const std::string &name, float value) const
+{
+    glUniform1f(getUniformLocation(name), static_cast<GLfloat>(value));
+}
+
+void Shader::setUniform(const std::string &name, const glm::mat4 &matrix) const
+{
+    glUniformMatrix4fv(getUniformLocation(name), 1, GL_FALSE, &(matrix[0][0]));
+}
+
+GLint Shader::getUniformLocation(const std::string &uniform_name) const
+{
+    GLint location = glGetUniformLocation(program_id_, uniform_name.c_str());
+    if (location == GL_INVALID_INDEX) {
+        throw std::runtime_error("'" + uniform_name + "' not found");
+    }
+    return location;
+}
+
+void Shader::errorCheck(GLuint shader, const std::string &shader_type) const
+{
+    int success;
+    char info_log[1024];
+    if (shader_type != std::string("program")) {
+        glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
+        if (!success) {
+            glGetShaderInfoLog(shader, 1024, NULL, info_log);
+            throw runtime_error(shader_type +
+                                " failed to compile: " + std::string(info_log));
+        }
+    } else {
+        glGetProgramiv(shader, GL_LINK_STATUS, &success);
+        if (!success) {
+            glGetProgramInfoLog(shader, 1024, NULL, info_log);
+            throw runtime_error(shader_type +
+                                " failed to link: " + std::string(info_log));
+        }
+    }
+}
+
+} // namespace yage
-- 
cgit