[SOLVED] CS代考计算机代写 // G-buffer renderer

// G-buffer renderer

#include “headers.h”
#include “renderer.h”
#include “toon.h”

// Draw a quad over the full screen.This generates a fragment for
// each pixel on the screen, allowing the fragment shader to run on
// each fragment.

void drawFullscreenQuad()

{
vec2 verts[4] = { vec2( -1, -1 ), vec2( -1, 1 ), vec2( 1, -1 ), vec2( 1, 1 ) };

GLuint VAO, VBO;

glGenVertexArrays( 1, &VAO );
glBindVertexArray( VAO );

glGenBuffers( 1, &VBO );
glBindBuffer( GL_ARRAY_BUFFER, VBO );

glBufferData( GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STATIC_DRAW );

glEnableVertexAttribArray( 0 );
glVertexAttribPointer( 0, 2, GL_FLOAT, GL_FALSE, 0, 0 );

glDrawArrays( GL_TRIANGLE_STRIP, 0, 4 );

glDeleteBuffers( 1, &VBO );
glDeleteVertexArrays( 1, &VAO );
}

// Render the scene in three passes.

void Renderer::render( wfModel *obj, mat4 &M, mat4 &MV, mat4 &MVP, vec3 &lightDir )

{
// Pass-through rendering

if (debug == 0) {

dummyProg->activate();
dummyProg->setMat4(“MVP”, MVP );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glEnable( GL_DEPTH_TEST );
obj->draw( dummyProg );
dummyProg->deactivate();
return;
}

// Pass 1: Store colour, normal, depth in G-Buffers

gbuffer->BindForWriting();

pass1Prog->activate();

pass1Prog->setMat4(“M”,M );
pass1Prog->setMat4(“MV”, MV );
pass1Prog->setMat4(“MVP”,MVP );

gbuffer->BindTexture( COLOUR_GBUFFER );
gbuffer->BindTexture( NORMAL_GBUFFER );
gbuffer->BindTexture( DEPTH_GBUFFER);

int activeDrawBuffers1[] = { COLOUR_GBUFFER, NORMAL_GBUFFER, DEPTH_GBUFFER };
gbuffer->setDrawBuffers( 3, activeDrawBuffers1 );

glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glEnable( GL_DEPTH_TEST );

obj->draw( pass1Prog );

pass1Prog->deactivate();

if (debug == 1) { // stop after pass 1
gbuffer->DrawGBuffers();
return;
}

// Pass 2: Store Laplacian (computed from depths) in G-Buffer

pass2Prog->activate();

pass2Prog->setVec2( “texCoordInc”, vec2( 1 / (float) windowWidth, 1 / (float) windowHeight ) );

pass2Prog->setInt( “depthSampler”, DEPTH_GBUFFER );

gbuffer->BindTexture( LAPLACIAN_GBUFFER );

int activeDrawBuffers2[] = { LAPLACIAN_GBUFFER };
gbuffer->setDrawBuffers( 1, activeDrawBuffers2 );

glClear( GL_COLOR_BUFFER_BIT );
glDisable( GL_DEPTH_TEST );

drawFullscreenQuad();

pass2Prog->deactivate();

if (debug == 2) { // stop after pass 2
gbuffer->DrawGBuffers();
return;
}

// Pass 3: Draw everything using data from G-Buffers

glBindFramebuffer( GL_DRAW_FRAMEBUFFER, 0 );
glClear( GL_COLOR_BUFFER_BIT );
glDisable( GL_DEPTH_TEST );

pass3Prog->activate();

pass3Prog->setVec2( “texCoordInc”, vec2( 1 / (float) windowWidth, 1 / (float) windowHeight ) );
pass3Prog->setVec3( “lightDir”, lightDir );

pass3Prog->setInt( “colourSampler”,COLOUR_GBUFFER );
pass3Prog->setInt( “normalSampler”,NORMAL_GBUFFER );
pass3Prog->setInt( “depthSampler”, DEPTH_GBUFFER );
pass3Prog->setInt( “laplacianSampler”, LAPLACIAN_GBUFFER );

gbuffer->BindTexture( COLOUR_GBUFFER );
gbuffer->BindTexture( NORMAL_GBUFFER );
gbuffer->BindTexture( DEPTH_GBUFFER );
gbuffer->BindTexture( LAPLACIAN_GBUFFER);

drawFullscreenQuad();

pass3Prog->deactivate();
}