void MyView::
windowViewDidReset(std::shared_ptr<tygra::Window> window,
int width,
int height)
{
//anything that needs updated when the screen size changes
glViewport(0, 0, width, height);
width_ = width;
height_ = height;
upDir_ = scene_->getUpDirection();
float far = scene_->getCamera().getFarPlaneDistance();
float near = scene_->getCamera().getNearPlaneDistance();
float fov = scene_->getCamera().getVerticalFieldOfViewInDegrees();
GLint viewport_size[4];
glGetIntegerv(GL_VIEWPORT, viewport_size);
aspect_ratio_ = viewport_size[2] / (float)viewport_size[3];
projection_xform_ = glm::perspective(fov, aspect_ratio_, near, far);
//deffered stuff
//g-buffer
glBindFramebuffer(GL_FRAMEBUFFER, gbuffer_fbo_);
//position
//store full-fat position
glBindTexture(GL_TEXTURE_RECTANGLE, gbuffer_position_tex_);
glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGB32F, width, height, 0, GL_RGB, GL_FLOAT, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_RECTANGLE, gbuffer_position_tex_, 0);
//normal. Only store x and y, reconstruct z in the fragment shader
glBindTexture(GL_TEXTURE_RECTANGLE, gbuffer_normal_tex_);
glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RG32F, width, height, 0, GL_RG, GL_FLOAT, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_RECTANGLE, gbuffer_normal_tex_, 0);
//mat colour. Store an index to an array of materials stored in a ubo
glBindTexture(GL_TEXTURE_RECTANGLE, gbuffer_matColour_tex_);
glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_R16F, width, height, 0, GL_RED, GL_FLOAT, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT2, GL_TEXTURE_RECTANGLE, gbuffer_matColour_tex_, 0);
//total storage per texel = 96 + 64 + 16 bits = 22 bytes
//full HD G-buffer sohuld use 45.6MB of GPU memory
glBindRenderbuffer(GL_RENDERBUFFER, gbuffer_depth_rbo_);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, gbuffer_depth_rbo_);
GLuint framebuffer_status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (framebuffer_status != GL_FRAMEBUFFER_COMPLETE) {
tglDebugMessage(GL_DEBUG_SEVERITY_HIGH_ARB, "framebuffer not complete");
}
GLenum buffers[] = { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2 };
glDrawBuffers(3, buffers);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
//l-buffer
GLenum modes[] = { GL_COLOR_ATTACHMENT0 };
glBindFramebuffer(GL_FRAMEBUFFER, lbuffer_fbo_);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, albedo_tex, 0);
glDrawBuffers(1, modes);
//glBindRenderbuffer(GL_RENDERBUFFER, lbuffer_colour_rbo_);
//glRenderbufferStorage(GL_RENDERBUFFER, GL_RGB32F, width, height);
//glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, lbuffer_colour_rbo_);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, gbuffer_depth_rbo_);
framebuffer_status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (framebuffer_status != GL_FRAMEBUFFER_COMPLETE) {
tglDebugMessage(GL_DEBUG_SEVERITY_HIGH_ARB, "framebuffer not complete");
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_RECTANGLE, gbuffer_position_tex_);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_RECTANGLE, gbuffer_normal_tex_);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_RECTANGLE, gbuffer_matColour_tex_);
for (int i = 1; i < POST_SHADER; i++){
GLuint program = shaderPrograms_[i];
glUseProgram(program);
GLint posTex = glGetUniformLocation(program, "sampler_world_position");
glUniform1i(posTex, 0);
GLint normTex = glGetUniformLocation(program, "sampler_world_normal");
glUniform1i(normTex, 1);
GLint matColTex = glGetUniformLocation(program, "sampler_world_matColour");
glUniform1i(matColTex, 2);
}
glActiveTexture(GL_TEXTURE3);
glBindTexture(GL_TEXTURE_2D_ARRAY, shadowMap_tex_);
GLuint program = shaderPrograms_[SPOT_LIGHT];
glUseProgram(program);
GLint smapLoc = glGetUniformLocation(program, "sampler_shadowMap");
glUniform1i(smapLoc, 3);
}
void Window::
onError(int error_code,
const char* description)
{
tglDebugMessage(GL_DEBUG_SEVERITY_HIGH_ARB, description);
}