BRDFLUTShader.cpp

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#include <tdme/engine/subsystems/framebuffer/BRDFLUTShader.h>
 
#include <tdme/tdme.h>
#include <tdme/engine/subsystems/framebuffer/FrameBufferRenderShader.h>
#include <tdme/engine/subsystems/renderer/Renderer.h>
#include <tdme/engine/Engine.h>
 
using tdme::engine::subsystems::framebuffer::BRDFLUTShader;
 
using tdme::engine::subsystems::framebuffer::FrameBufferRenderShader;
using tdme::engine::subsystems::renderer::Renderer;
using tdme::engine::Engine;
 
BRDFLUTShader::BRDFLUTShader(Renderer* renderer)
{
    this->renderer = renderer;
}
 
BRDFLUTShader::~BRDFLUTShader()
{
}
 
bool BRDFLUTShader::isInitialized()
{
    return initialized;
}
 
void BRDFLUTShader::initialize()
{
    auto shaderVersion = renderer->getShaderVersion();
    vertexShaderId = renderer->loadShader(
        renderer->SHADER_VERTEX_SHADER,
        "shader/" + shaderVersion + "/framebuffer",
        "render_vertexshader.vert"
    );
    if (vertexShaderId == 0) return;
 
    fragmentShaderId = renderer->loadShader(
        renderer->SHADER_FRAGMENT_SHADER,
        "shader/" + shaderVersion + "/framebuffer/brdflut",
        "render_brdflut_fragmentshader.frag"
    );
    if (fragmentShaderId == 0) return;
 
    programId = renderer->createProgram(renderer->PROGRAM_OBJECTS);
    renderer->attachShaderToProgram(programId, vertexShaderId);
    renderer->attachShaderToProgram(programId, fragmentShaderId);
    if (renderer->isUsingProgramAttributeLocation() == true) {
        renderer->setProgramAttributeLocation(programId, 0, "inVertex");
        renderer->setProgramAttributeLocation(programId, 2, "inTextureUV");
    }
    if (renderer->linkProgram(programId) == false) return;
 
    //
    colorBufferTextureId = renderer->createGBufferGeometryTexture(BRDFLUT_WIDTH, BRDFLUT_HEIGHT);
    frameBufferId = renderer->createFramebufferObject(renderer->ID_NONE, colorBufferTextureId, renderer->ID_NONE, renderer->ID_NONE);
 
    //
    initialized = true;
}
 
void BRDFLUTShader::generate() {
    // use default context
    auto contextIdx = renderer->CONTEXTINDEX_DEFAULT;
 
    //
    renderer->bindFrameBuffer(frameBufferId);
    renderer->setViewPort(BRDFLUT_WIDTH, BRDFLUT_HEIGHT);
    renderer->updateViewPort();
 
    //
    renderer->useProgram(contextIdx, programId);
    renderer->setLighting(contextIdx, renderer->LIGHTING_NONE);
 
    //
    renderer->disableDepthBufferWriting();
    renderer->disableDepthBufferTest();
    renderer->disableCulling(contextIdx);
 
    // clear
    renderer->setClearColor(0.0f, 0.0f, 0.0f, 1.0f);
    renderer->clear(renderer->CLEAR_COLOR_BUFFER_BIT);
 
    // use frame buffer render shader
    auto frameBufferRenderShader = Engine::getFrameBufferRenderShader();
 
    //
    renderer->bindVerticesBufferObject(contextIdx, frameBufferRenderShader->getVBOVertices());
    renderer->bindTextureCoordinatesBufferObject(contextIdx, frameBufferRenderShader->getVBOTextureCoordinates());
 
    // draw
    renderer->drawTrianglesFromBufferObjects(contextIdx, 2, 0);
 
    // unbind buffers
    renderer->unbindBufferObjects(contextIdx);
 
    // unset
    renderer->enableCulling(contextIdx);
    renderer->enableDepthBufferTest();
    renderer->enableDepthBufferWriting();
 
    //
    renderer->bindFrameBuffer(Engine::getRenderer()->FRAMEBUFFER_DEFAULT);
    renderer->setViewPort(Engine::instance->width, Engine::instance->height);
    renderer->updateViewPort();
}