Shaders

engine/render/shader.cpp

@@ -0,0 +1,92 @@
+#include <assert.h>
+#include "utils/logger.h"
+#include "render/shader.h"
+#include "filesystem/filemanager.h"
+#include "filesystem/stream.h"
+
+GLuint CreateShader(GLenum shaderType, const char* filename)
+{
+	StreamBase* stream = g_fileManager->OpenStream( filename, FileAccess_Read );
+	if ( !stream )
+	{
+		LogMsg( "CreateShader: failed to open file %s", filename );
+		assert( 0 );
+	}
+
+	stream->Seek( Seek_End, 0 );
+	size_t length = stream->Tell();
+	stream->Seek( Seek_Begin, 0 );
+
+	std::string content;
+	content.resize( length + 1 );
+	stream->Read( (void*)content.data(), length );
+
+	content[length] = '\0';
+
+	const char* contentCStr = content.c_str();
+
+	GLuint shader = glCreateShader(shaderType);
+	glShaderSource(shader, 1, &contentCStr, NULL);
+	glCompileShader(shader);
+
+	int  success;
+	char infoLog[512];
+	glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
+
+	if (!success)
+	{
+		glGetShaderInfoLog(shader, 512, NULL, infoLog);
+		LogMsg("Failed to compile shader %s\n%s", filename, infoLog);
+	}
+
+	LogMsg("created shader from file %s", filename);
+	return shader;
+}
+
+Shader::Shader() :
+	m_name(nullptr),
+	m_stride(0),
+	m_layout_count(0)
+{
+
+}
+
+Shader::~Shader()
+{
+	if (m_name)
+		free( (void*)m_name );
+
+	Destroy();
+}
+
+void Shader::Create(const char* name, const char* vsfilepath, const char* psfilepath)
+{
+	//m_name = strdup( name );
+
+	GLuint vertexShader = CreateShader(GL_VERTEX_SHADER, vsfilepath);
+	GLuint fragmentShader = CreateShader(GL_FRAGMENT_SHADER, psfilepath);
+
+	m_program = glCreateProgram();
+	glAttachShader(m_program, vertexShader);
+	glAttachShader(m_program, fragmentShader);
+	AllocateAttributes();
+	glLinkProgram(m_program);
+	 
+	glDeleteShader(vertexShader);
+	glDeleteShader(fragmentShader);
+
+	int  success;
+	char infoLog[512];
+	glGetProgramiv(m_program, GL_LINK_STATUS, &success);
+
+	if (!success)
+	{
+		glGetProgramInfoLog(m_program, 512, NULL, infoLog);
+		LogMsg("Failed to link program %s", infoLog);
+	}
+}
+
+void Shader::Destroy()
+{
+	glDeleteProgram(m_program);
+}