//-------------------------------------------------------------------------

//

//  File: Glass.m

//

//  Abstract: Glass GLSL Exhibit

//           

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//-------------------------------------------------------------------------

#import "Glass.h"

@implementation Glass

- (void) getTextures

{

    houseTexture       = [self loadTextureFromResource: @"House" ];

    frameBufferTexture = [self loadFrameBufferTexture:viewport];

} // getTextures

- (void) setupUniforms

{

    glUseProgramObjectARB(programObject);

    glUniform3fARB([self getUniformLocation:programObject uniformName:"LightPos"], 0.0, 0.0, 4.0);

    glUniform3fARB([self getUniformLocation:programObject uniformName:"BaseColor"], 0.4, 0.4, 1.0);

    glUniform1fARB([self getUniformLocation:programObject uniformName:"Depth"], 0.1);

    glUniform1fARB([self getUniformLocation:programObject uniformName:"MixRatio"], 1);

    glUniform1iARB([self getUniformLocation:programObject uniformName:"EnvMap"], 0);

    glUniform1iARB([self getUniformLocation:programObject uniformName:"RefractionMap"], 1);

} // setupUniforms

- (void) initLazy

{

    [super initLazy];

    // Setup GLSL

    // Here we get a new model

    model = [[Models alloc] init];

    // get all the textures

    [self getTextures];

    // Load vertex and fragment shaders

    [self loadShadersFromResource:@"Glass" ];

    // Setup uniforms

    [self setupUniforms];

} // initLazy

- (void) dealloc

{

    glDeleteTextures(1, &houseTexture);

    glDeleteTextures(1, &frameBufferTexture);

    [model dealloc];

    [super dealloc];

} // dealloc 

- (NSString *) name

{

    return @"Glass";

} // name

- (NSString *) descriptionFilename

{

    return [appBundle pathForResource: @"Glass" ofType: @"rtf"];

} // descriptionFilename

- (void) setupRenderFrameUniforms:(GLint *)theViewPort

{

    GLfloat v[4] = { 0.0f, 0.0f, 0.0f, 0.0f };

    v[0] = (GLfloat)viewport[2];

    v[1] = (GLfloat)viewport[3];

    v[2] = (GLfloat)NextHighestPowerOf2FromInt( viewport[2] );

    v[3] = (GLfloat)NextHighestPowerOf2FromInt( viewport[3] );

    glUniform1fARB([self getUniformLocation:programObject uniformName:"FrameWidth"], v[0] );

    glUniform1fARB([self getUniformLocation:programObject uniformName:"FrameHeight"], v[1] );

    glUniform1fARB([self getUniformLocation:programObject uniformName:"textureWidth"], v[2] );

    glUniform1fARB([self getUniformLocation:programObject uniformName:"textureHeight"], v[3] );

} // setupRenderFrameUniforms

- (void) renderFrame

{

    [super renderFrame];

    glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT);

    glDisable(GL_TEXTURE_2D);

    glDisable(GL_TEXTURE_3D);

    glEnable(GL_LIGHTING);

    glEnable(GL_LIGHT0);

    glEnable(GL_LIGHT1);

    glColor4f(1, 1, 1, 1);

    glTranslatef(0, 0, 1);

    [model drawModel:kModelSolidSmallTeapot];

    glTranslatef(0, 0, -1);

    glEnable(GL_BLEND);

    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    glUseProgramObjectARB(programObject);

    glGetIntegerv(GL_VIEWPORT,viewport);

    [self setupRenderFrameUniforms:viewport];

    [self copyFramebufferToTexture:frameBufferTexture];

    glActiveTexture(GL_TEXTURE0);

    glBindTexture(GL_TEXTURE_2D, houseTexture);

    glActiveTexture(GL_TEXTURE1);

    glBindTexture(GL_TEXTURE_2D, frameBufferTexture);

    [self copyFramebufferToTexture:frameBufferTexture];

    glActiveTexture(GL_TEXTURE0);

    [model drawModel:kModelSolidTeapot];

    glUseProgramObjectARB(NULL);

    glPopAttrib();

} // renderFrame

@end