#include <GL/gl.h>

#include "render.h"
#include "tga.h"

void initRender() {
	// Set the clear colour to black
	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
	
	GLfloat light0_ambient[] = {0.1f, 0.1f, 0.1f, 1.0f};
	GLfloat light0_diffuse[] = {1.0f, 1.0f, 1.0f, 1.0f};
	GLfloat light0_specular[] = {1.0f, 1.0f, 1.0f, 1.0f};
	GLfloat light0_position[] = {0.0f, 0.0f, 10.0f, 1.0f};
	
	glLightfv(GL_LIGHT0, GL_AMBIENT, light0_ambient);
	glLightfv(GL_LIGHT0, GL_DIFFUSE, light0_diffuse);
	glLightfv(GL_LIGHT0, GL_SPECULAR, light0_specular);
	glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
    
	glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, 1.0f);
	glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, 0.05f);
	glLightf(GL_LIGHT0, GL_QUADRATIC_ATTENUATION, 0.001f);
	
	texImage = readTga("out/assets/wall01side.tga");
	glTexImage2D(GL_TEXTURE_2D,
	             0,
	             texImage->imageComponents,
	             texImage->header.imageWidth,
	             texImage->header.imageHeight,
	             0,
	             texImage->imageFormat,
	             GL_UNSIGNED_BYTE,
	             texImage->bytes);
	free(texImage->bytes);
	
	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}

void resizeStage(GLsizei width, GLsizei height) {
	if (height == 0)
		height = 1;
	
	// Set device viewport dimensions
	glViewport(0, 0, width, height);
	// Switch to projection matrix
	glMatrixMode(GL_PROJECTION);
	// Reset the projection matrix
	glLoadIdentity();
	
	GLfloat aspectRatio = (GLfloat) width / (GLfloat) height;
	
	glOrtho(-10.0, 10.0, -10.0/aspectRatio, 10.0/aspectRatio, 128.0, -128.0);
	
	glRotatef(45.0f, 1.0f, 0.0f, 0.0f);
	glRotatef(45.0f, 0.0f, 1.0f, 0.0f);
	
	glMatrixMode(GL_MODELVIEW);
}