1 files changed, 134 insertions, 0 deletions
diff --git a/07-july/src/graphics/shaders.c b/07-july/src/graphics/shaders.c
new file mode 100644
index 0000000..ef4ec0a
--- /dev/null
+++ b/07-july/src/graphics/shaders.c
@@ -0,0 +1,134 @@
+#include "shaders.h"
+#include "../util/util.h"
+
+#include <stdlib.h>
+
+static void CompileShader(const char* source, GLuint shaderID)
+{
+    glShaderSource(shaderID, 1, &source, 0);
+    glCompileShader(shaderID);
+    GLint error;
+    glGetShaderiv(shaderID, GL_COMPILE_STATUS, &error);
+    if(error != GL_TRUE)
+    {
+        GLint logLenth;
+        glGetShaderiv(shaderID, GL_INFO_LOG_LENGTH, &logLenth);
+        GLchar buffer[logLenth];
+        glGetShaderInfoLog(shaderID, logLenth, &logLenth, buffer);
+        glDeleteShader(shaderID);
+        Util_FatalError(buffer);
+    }
+}
+
+
+GLuint Shader_CompileShaders(const char* vertexShader, const char* fragmentShader)
+{
+    char* vertexShaderSource = Util_LoadFile(vertexShader);
+    char* fragmentShaderSource = Util_LoadFile(fragmentShader);
+
+    GLuint vs = 0, fs = 0, program;
+    vs = glCreateShader(GL_VERTEX_SHADER);
+    fs = glCreateShader(GL_FRAGMENT_SHADER);
+
+    if(vs == 0 || fs == 0)
+        Util_FatalError("Shaders could not be created\n");
+
+    program = glCreateProgram();
+
+    CompileShader(vertexShaderSource, vs);
+    CompileShader(fragmentShaderSource, fs);
+
+    glAttachShader(program, vs);
+    glAttachShader(program, fs);
+
+    glLinkProgram(program);
+
+    GLint error;
+    glGetProgramiv(program, GL_LINK_STATUS, &error);
+
+    if(error != GL_TRUE)
+    {
+        GLint logLength;
+        glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
+
+        GLchar buffer[logLength];
+        glGetProgramInfoLog(program, logLength, &logLength, buffer);
+
+        glDeleteProgram(program);
+        glDeleteShader(vs);
+        glDeleteShader(fs);
+
+        Util_FatalError(buffer);
+    }
+
+    glDetachShader(program, vs);
+    glDetachShader(program, fs);
+    glDeleteShader(vs);
+    glDeleteShader(fs);
+
+    free(vertexShaderSource);
+    free(fragmentShaderSource);
+
+    return program;
+}
+
+GLint Shader_GetUniformLocation( GLuint programID, const char* uniformName )
+{
+    GLint u = glGetUniformLocation(programID, uniformName);
+    if(u == GL_INVALID_INDEX)
+        Util_FatalError("Uniform variable could not be found!");
+    else
+        return u;
+
+    return 0;
+}
+
+GLint Shader_GetAttribLocation ( GLuint programID, const char* attributeName )
+{
+    GLint attrLocation = glGetAttribLocation(programID, attributeName);
+    if(attrLocation < 0)
+        Util_FatalError("Attribute could not be found\n");
+    return attrLocation;
+}
+
+void Shader_Destroy(GLuint programID)
+{
+    glUseProgram(0);
+    glDeleteProgram(programID);
+}
+
+void Shader_SetUniformMat4( GLuint programID, const char* name, const float *matrix )
+{
+    GLint location = Shader_GetUniformLocation(programID, name);
+    glUniformMatrix4fv(location, 1, GL_FALSE, matrix);
+}
+
+void Shader_SetUniformFloat( GLuint programID, const char* name, const float val )
+{
+    GLint location = Shader_GetUniformLocation(programID, name);
+    glUniform1f(location, val);
+}
+
+void Shader_SetUniformVec2( GLuint programID, const char* name, const float vec[2] )
+{
+    GLint location = Shader_GetUniformLocation(programID, name);
+    glUniform2fv(location, 1, vec);
+}
+
+void Shader_SetUniformVec3( GLuint programID, const char* name, const float vec[3] )
+{
+    GLint location = Shader_GetUniformLocation(programID, name);
+    glUniform3fv(location, 1, vec);
+}
+
+void Shader_SetUniformVec4( GLuint programID, const char* name, const float vec[4] )
+{
+    GLint location = Shader_GetUniformLocation(programID, name);
+    glUniform4fv(location, 1, vec);
+}
+
+void Shader_SetUniformInt( GLuint programID, const char* name, const int val )
+{
+    GLint location = Shader_GetUniformLocation(programID, name);
+    glUniform1i(location, val);
+}