SimplePostProcPass::SimplePostProcPass(
const QString & fragmentShaderSource,
GLenum outputTextureFormat,
GLenum outputTextureFiltering)
: m_textureFormat(outputTextureFormat)
{
initializeFbo(outputTextureFiltering);
m_quad = new glowutils::ScreenAlignedQuad(
glowutils::createShaderFromFile(GL_FRAGMENT_SHADER, fragmentShaderSource.toStdString()));
}
SimplePostProcPass::SimplePostProcPass(
const QString & vertexShaderSource,
const QString & fragmentShaderSource,
GLenum outputTextureFormat,
GLenum outputTextureFiltering)
: m_textureFormat(outputTextureFormat)
{
initializeFbo(outputTextureFiltering);
glow::ref_ptr<glow::Program> program = new glow::Program();
program->attach(glowutils::createShaderFromFile(GL_VERTEX_SHADER, vertexShaderSource.toStdString()),
glowutils::createShaderFromFile(GL_FRAGMENT_SHADER, fragmentShaderSource.toStdString()));
m_quad = new glowutils::ScreenAlignedQuad(program);
}
void PointLightnigRenderPass::initialize()
{
if (m_initialized) {
dsWarning() << "Render pass has been already initialized";
return;
}
m_pShaderProgram = ShaderProgram::createFromSource(vertexShaderSrc, fragmentShaderSrc);
if (!m_pShaderProgram) {
return;
}
// Initialize target render buffer
initializeFbo();
glGenVertexArrays(1, &m_vertexArray);
glBindVertexArray(m_vertexArray);
// Points define the view port (where the drawing will be performed).
GLfloat pointCoords[] = {
-1.0f, -1.0f,
1.0f, -1.0f,
1.0f, 1.0f,
-1.0f, 1.0f
};
// Coordinatex of two triangles vertices to coved the view port
GLfloat texCoords[] = {
0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
0.0f, 1.0f
};
// Indices in texCoords array for two trianges covering the view port
GLuint elements[] = {
0, 1, 2,
0, 2, 3
};
glGenBuffers(1, &m_vertexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, m_vertexBuffer);
glBufferData(GL_ARRAY_BUFFER, 2 * 4 * sizeof(GLfloat), pointCoords, GL_STATIC_DRAW);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(0);
glGenBuffers(1, &m_texCoordBuffer);
glBindBuffer(GL_ARRAY_BUFFER, m_texCoordBuffer);
glBufferData(GL_ARRAY_BUFFER, 2 * 4 * sizeof(GLfloat), texCoords, GL_STATIC_DRAW);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(1);
glGenBuffers(1, &m_elementsBuffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_elementsBuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, 6 * sizeof(GLuint), elements, GL_STATIC_DRAW);
DS_CHECK_GL_ERROR;
glBindVertexArray(0);
m_initialized = true;
}
