GLUSboolean update(GLUSfloat time)
{
// Bias needed to convert the from [-1;1] to [0;1]
GLfloat biasMatrix[16] = {0.5f, 0.0f, 0.0f, 0.0f,
0.0f, 0.5f, 0.0f, 0.0f,
0.0f, 0.0f, 0.5f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f};
// Frame buffer has another view port and so perspective projection. Needed for projected texturing of the mirror texture.
GLfloat viewProjectionBiasTextureMatrix[16];
// This matrix is used to flip the rendered object upside down.
GLfloat scaleMatrix[16];
// Store current width and height for later reseting.
GLuint width = g_width;
GLuint height = g_height;
//
// Upside down rendering to frame buffer.
//
glBindFramebuffer(GL_FRAMEBUFFER, g_fboMirrorTexture);
reshape(TEXTURE_WIDTH, TEXTURE_HEIGHT);
glClearColor(1.0f, 1.0f, 1.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glusMatrix4x4Identityf(scaleMatrix);
glusMatrix4x4Scalef(scaleMatrix, 1.0f, -1.0f, 1.0f);
glFrontFace(GL_CW);
if (!updateWavefront(time, scaleMatrix))
{
return GLUS_FALSE;
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// Save the current projection matrix for later usage.
glusMatrix4x4Copyf(viewProjectionBiasTextureMatrix, g_viewProjectionMatrix, GLUS_FALSE);
glusMatrix4x4Multiplyf(viewProjectionBiasTextureMatrix, biasMatrix, viewProjectionBiasTextureMatrix);
//
// Scene rendering
//
reshape(width, height);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Normal rendering
glusMatrix4x4Identityf(scaleMatrix);
glFrontFace(GL_CCW);
if (!updateWavefront(time, scaleMatrix))
{
return GLUS_FALSE;
}
glUseProgram(g_program.program);
// This matrix is needed to calculate the vertices into the frame buffer render pass.
glUniformMatrix4fv(g_viewProjectionBiasTextureMatrixLocation, 1, GL_FALSE, viewProjectionBiasTextureMatrix);
glBindVertexArray(g_vao);
glDrawElements(GL_TRIANGLES, g_numberIndicesSphere, GL_UNSIGNED_INT, 0);
return GLUS_TRUE;
}
GLUSboolean update(GLUSfloat time)
{
GLenum drawBuffers[] = { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1 };
GLfloat modelMatrix[16];
GLint i;
//
// Rendering scene to frame buffer.
//
glBindFramebuffer(GL_FRAMEBUFFER, g_ssaoFBO);
glDrawBuffers(2, drawBuffers);
reshape(TEXTURE_WIDTH, TEXTURE_HEIGHT);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
for (i = 0; i < 3; i++)
{
glusMatrix4x4Identityf(modelMatrix);
glusMatrix4x4Translatef(modelMatrix, (GLfloat)(i - 1) * 4.1f, 0.0f, 0.0f);
glusMatrix4x4RotateRyf(modelMatrix, 45.0f);
if (!updateWavefront(time, modelMatrix))
{
return GLUS_FALSE;
}
}
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, g_texture);
glUseProgram(g_program.program);
glBindVertexArray(g_vao);
glDrawElements(GL_TRIANGLES, g_numberIndicesPlane, GL_UNSIGNED_INT, 0);
//
// SSAO rendering step.
//
glBindFramebuffer(GL_FRAMEBUFFER, g_blurFBO);
glDrawBuffer(GL_COLOR_ATTACHMENT0);
glClear(GL_COLOR_BUFFER_BIT);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, g_ssaoTexture);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, g_ssaoNormalTexture);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, g_ssaoDepthTexture);
glActiveTexture(GL_TEXTURE3);
glBindTexture(GL_TEXTURE_2D, g_ssaoRotationNoiseTexture);
glActiveTexture(GL_TEXTURE0);
glUseProgram(g_ssaoProgram.program);
glBindVertexArray(g_ssaoVAO);
glDrawElements(GL_TRIANGLES, g_numberIndicesPostprocessPlane, GL_UNSIGNED_INT, 0);
glBindTexture(GL_TEXTURE_2D, 0);
//
// Blur rendering step.
//
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glDrawBuffer(GL_COLOR_ATTACHMENT0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, g_ssaoTexture);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, g_blurTexture);
glActiveTexture(GL_TEXTURE0);
glUseProgram(g_blurProgram.program);
glBindVertexArray(g_blurVAO);
glDrawElements(GL_TRIANGLES, g_numberIndicesPostprocessPlane, GL_UNSIGNED_INT, 0);
glBindTexture(GL_TEXTURE_2D, 0);
return GLUS_TRUE;
}