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Fixed blurring of flames with stencil buffer.

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This commit is contained in:
Faerbit 2015-03-04 11:25:02 +01:00
parent a88112d639
commit fa47c93b46
4 changed files with 30 additions and 53 deletions
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2
data/shader/flame.fsh
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@ -6,5 +6,5 @@ out vec4 oColor;
void main() {
oColor = vec4(fColor, 1.0);
oColor = vec4(fColor, 0.6);
}

24
data/shader/flame_post.fsh
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@ -2,7 +2,6 @@
in vec2 vTexCoord;
uniform sampler2D flame_fbo;
uniform sampler2D light_fbo;
uniform int windowSizeX;
uniform int windowSizeY;
@ -12,24 +11,11 @@ out vec4 oColor;
const float lookup_offset = 4.0;
void main() {
vec4 color = texture(flame_fbo, vTexCoord).rgba;
if (color == vec4(0.0, 0.0, 0.0, 1.0)) {
oColor = texture(light_fbo, vTexCoord).rgba;
}
else {
vec4 sum = vec4(0.0);
for(float i = -lookup_offset; i<=lookup_offset; i+=1.0) {
for(float j = -lookup_offset; j<=lookup_offset; j+=1.0) {
vec4 flame_pixel = texture(flame_fbo, vec2(vTexCoord.x + i * 1.0/(windowSizeX/2.0), vTexCoord.y + j * 1.0/(windowSizeY/2.0)))/pow(lookup_offset*2+1, 2.0);
vec4 light_pixel = texture(light_fbo, vec2(vTexCoord.x + i * 1.0/(windowSizeX/2.0), vTexCoord.y + j * 1.0/(windowSizeY/2.0)))/pow(lookup_offset*2+1, 2.0);
if (flame_pixel == vec4(0.0, 0.0, 0.0, 1.0)) {
sum += light_pixel;
}
else {
sum += mix(flame_pixel, light_pixel, 0.7);
}
}
vec4 sum = vec4(0.0);
for(float i = -lookup_offset; i<=lookup_offset; i+=1.0) {
for(float j = -lookup_offset; j<=lookup_offset; j+=1.0) {
sum += texture(light_fbo, vec2(vTexCoord.x + i * 1.0/(windowSizeX/2.0), vTexCoord.y + j * 1.0/(windowSizeY/2.0)))/pow(lookup_offset*2+1, 2.0);
}
oColor = sum;
}
oColor = sum;
}

54
graphics.cc
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@ -92,8 +92,8 @@ void Graphics::init(Level* level) {
glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &number_of_texture_units);
printf("Your graphics card supports %d texture units.\n", number_of_texture_units);
// Exit if we need more texture units
if (number_of_texture_units < 16) {
printf("You need at least 16 texture units to run this application. Exiting\n");
if (number_of_texture_units < 15) {
printf("You need at least 15 texture units to run this application. Exiting\n");
exit(-1);
}
@ -142,28 +142,12 @@ void Graphics::init(Level* level) {
}
}
flame_fbo_color_texture = SharedTexture2D(new Texture2D(windowSize, GL_RGBA8));
flame_fbo_color_texture->setMinFilter(GL_NEAREST);
flame_fbo_color_texture->setMagFilter(GL_NEAREST);
flame_fbo_color_texture->setWrapS(GL_CLAMP_TO_BORDER);
flame_fbo_color_texture->setWrapT(GL_CLAMP_TO_BORDER);
flame_fbo_depth_texture = SharedTexture2D(new Texture2D(windowSize, GL_DEPTH_COMPONENT24));
flame_fbo_depth_texture->setMinFilter(GL_NEAREST);
flame_fbo_depth_texture->setMagFilter(GL_NEAREST);
flame_fbo_depth_texture->setWrapS(GL_CLAMP_TO_BORDER);
flame_fbo_depth_texture->setWrapT(GL_CLAMP_TO_BORDER);
framebuffer_flames = SharedFrameBufferObject(new FrameBufferObject());
framebuffer_flames->attachColorTexture("oColor", flame_fbo_color_texture);
framebuffer_flames->setDepthTexture(flame_fbo_depth_texture);
framebuffer_flames->setClearColor(glm::vec4(0.0f, 0.0f, 0.0f, 1.0f));
framebuffer_flames->validate();
light_fbo_color_texture = SharedTexture2D(new Texture2D(windowSize, GL_RGBA8));
light_fbo_color_texture->setMinFilter(GL_NEAREST);
light_fbo_color_texture->setMagFilter(GL_NEAREST);
light_fbo_color_texture->setWrapS(GL_CLAMP_TO_BORDER);
light_fbo_color_texture->setWrapT(GL_CLAMP_TO_BORDER);
light_fbo_depth_texture = SharedTexture2D(new Texture2D(windowSize, GL_DEPTH_COMPONENT24));
light_fbo_depth_texture = SharedTexture2D(new Texture2D(windowSize, GL_DEPTH24_STENCIL8));
light_fbo_depth_texture->setMinFilter(GL_NEAREST);
light_fbo_depth_texture->setMagFilter(GL_NEAREST);
light_fbo_depth_texture->setWrapS(GL_CLAMP_TO_BORDER);
@ -175,8 +159,7 @@ void Graphics::init(Level* level) {
framebuffer_light->validate();
flamePostShader->use();
flamePostShader->setTexture("flame_fbo", flame_fbo_color_texture, 15);
flamePostShader->setTexture("light_fbo", light_fbo_color_texture, 16);
flamePostShader->setTexture("light_fbo", light_fbo_color_texture, 15);
flamePostShader->setUniform("windowSizeX", int(windowSize.x));
flamePostShader->setUniform("windowSizeY", int(windowSize.y));
@ -294,14 +277,16 @@ void Graphics::render(double time)
// render the level
level->render(lightingShader, true, &lightingViewProjectionMatrix, &depthBiasVPs);
// draw flames on top
// cull faces to get consistent color while using alpha
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
// draw flames on top
framebuffer_flames->bind();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_STENCIL_TEST);
glStencilFunc(GL_ALWAYS, 1, 0xFF); //Set any stencil to 1
glStencilFunc(GL_ALWAYS, 1, 0xFF);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
glStencilMask(0xFF);//write to stencil buffer
glClear(GL_STENCIL_BUFFER_BIT);//clear stencil buffer
flameShader->use();
flameShader->setUniform("viewProjectionMatrix", lightingViewProjectionMatrix);
@ -319,11 +304,20 @@ void Graphics::render(double time)
glDisable(GL_CULL_FACE);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glStencilFunc(GL_EQUAL, 1, 0xFF); //Pass test if stencil value is 1
glStencilMask(0x00); //don't write to stencil buffer
flamePostShader->use();
fullscreen_quad->render();
glDisable(GL_STENCIL_TEST);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBindFramebuffer(GL_READ_FRAMEBUFFER, framebuffer_light->getObjectName());
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBlitFramebuffer(0, 0, windowSize.x, windowSize.y, 0, 0, windowSize.x, windowSize.y,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
}
bool Graphics::compareLightDistances(Light a, Light b) {
@ -406,8 +400,8 @@ void Graphics::resize(glm::uvec2 windowSize) {
for (unsigned int i = 0; i<depth_directionalMaps.size(); i++) {
depth_directionalMaps.at(i)->resize(glm::vec2(windowSize.x, windowSize.y));
}
flame_fbo_color_texture->resize(windowSize);
flame_fbo_depth_texture->resize(windowSize);
light_fbo_color_texture->resize(windowSize);
light_fbo_depth_texture->resize(windowSize);
flamePostShader->setUniform("windowSizeX", int(windowSize.x));
flamePostShader->setUniform("windowSizeY", int(windowSize.y));
}

3
graphics.hh
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@ -39,9 +39,6 @@ class Graphics {
std::vector<SharedFrameBufferObject> framebuffer_directional;
std::vector<SharedTextureCubeMap> depth_cubeMaps;
SharedFrameBufferObject framebuffer_cube;
SharedFrameBufferObject framebuffer_flames;
SharedTexture2D flame_fbo_color_texture;
SharedTexture2D flame_fbo_depth_texture;
SharedFrameBufferObject framebuffer_light;
SharedTexture2D light_fbo_color_texture;
SharedTexture2D light_fbo_depth_texture;