void display (void) {
glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // Clear the background of our window to black
glClear(GL_COLOR_BUFFER_BIT); //Clear the colour buffer
glLoadIdentity(); // Load the Identity Matrix to reset our drawing locations
glTranslatef(0.0f, 0.0f, -5.0f);
renderStars(20);
renderSun(7, 4,-20);
renderAsteroid(-1.75, -1.25, 0);
renderShip(0,0,0);
glFlush(); // Flush the OpenGL buffers to the window
}
void Sun::Render(const CameraSpectator &camera)
{
if (!program)
initShaders();
glm::mat4 biasMVP = biasMatrix * camera.GetCameraMatrix();
glm::vec4 biassedPosition = biasMVP * glm::vec4(position,1.0);
biassedPosition /= biassedPosition.w;
//copy existing depth buffer to depth texture
glBindTexture(GL_TEXTURE_2D, texIdDepth[0]);
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, camera.GetScreenWidth(), camera.GetScreenHeight());
//draw sun
glBindFramebuffer(GL_FRAMEBUFFER, fboId);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texIdColor[0], 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, texIdDepth[1], 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
renderSun(camera);
//apply depth test
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texIdColor[1], 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, texIdColor[0]);
glActiveTexture(GL_TEXTURE1); glBindTexture(GL_TEXTURE_2D, texIdDepth[1]);
glActiveTexture(GL_TEXTURE2); glBindTexture(GL_TEXTURE_2D, texIdDepth[0]);
depthTestProgram->Use();
renderRect();
depthTestProgram->UnUse();
//apply radial blur and render to screen
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_COLOR);
glEnable(GL_BLEND);
glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, texIdColor[1]);
radialBlurProgram->Use();
glUniform2f(radialBlurProgram->GetUniformLocation("sourcePos"), biassedPosition.x, biassedPosition.y);
glDisable(GL_DEPTH_TEST);
renderRect();
glDisable(GL_DEPTH_TEST);
radialBlurProgram->UnUse();
glDisable(GL_BLEND);
}
void LensFlareSunDemo::renderSky()
{
skyShader.bindShader();
renderSkyPlane(&camera);
skyShader.unbindShader();
setOrthographicProjection();
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
renderSun(-64.0f,-64.0f);
GLfloat center_x = WIDTH * 0.5f;
GLfloat center_y = HEIGHT * 0.5f;
GLfloat screenPos_x = -64.0f;
GLfloat screenPos_y = -64.0f;
// screenPos is the onscreen position of the sun
// mind that the pixel coordinates have been scaled
// to fit our viewport
GLfloat dx = center_x - screenPos_x;
GLfloat dy = center_y - screenPos_y;
GLfloat len = sqrt(dx * dx + dy * dy);
// normalize the vector
GLfloat vx = dx / len;
GLfloat vy = dy / len;
// choose a spacing between elements
dx = vx * len * 0.4f;
dy = vy * len * 0.4f;
// note that we already are in 2D (orthogonal)
// mode here
glPushMatrix();
glTranslatef(screenPos_x, screenPos_y, 0);
// travel down the line and draw the elements
int numElements = 4;
glBindTexture(GL_TEXTURE_2D,streaks4.texture);
glTranslatef(dx, dy, 0);
renderFlare();
glBindTexture(GL_TEXTURE_2D,halo3.texture);
glTranslatef(dx, dy, 0);
renderFlare();
glBindTexture(GL_TEXTURE_2D,bigGlow3.texture);
glTranslatef(dx, dy, 0);
renderFlare();
glBindTexture(GL_TEXTURE_2D,hardGlow2.texture);
glTranslatef(dx, dy, 0);
renderFlare();
glPopMatrix();
glDisable(GL_BLEND);
restorePerspectiveProjection();
}
