faerbit/Saxum
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Now also blurring the edges of the flames.

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This commit is contained in:
Faerbit 2015-03-04 12:13:58 +01:00
parent fa47c93b46
commit a811ed57be
3 changed files with 46 additions and 15 deletions
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7
data/shader/flame.fsh
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@ -4,7 +4,14 @@ in vec3 fColor;
out vec4 oColor;
uniform bool withColor;
void main() {
if (withColor) {
oColor = vec4(fColor, 0.6);
}
else {
oColor = vec4(0.0, 0.0, 0.0, 0.0);
}
}

10
data/shader/flame.gsh
View File

@ -1,6 +1,6 @@
#version 150
uniform mat4 viewProjectionMatrix;
uniform mat4 modelViewProjectionMatrix;
uniform float time;
uniform bool bottom;
uniform bool left;
@ -62,19 +62,19 @@ void main() {
float rightAngle = PI * 2.0 / resolution * (j+1);
vec4 offset = vec4(cos(rightAngle) * downRadius, i, -sin(rightAngle) * downRadius, 0.0);
gl_Position = gl_in[0].gl_Position + viewProjectionMatrix * offset;
gl_Position = gl_in[0].gl_Position + modelViewProjectionMatrix * offset;
EmitVertex();
offset = vec4(cos(rightAngle) * upRadius, i + step, -sin(rightAngle) * upRadius, 0.0);
gl_Position = gl_in[0].gl_Position + viewProjectionMatrix * offset;
gl_Position = gl_in[0].gl_Position + modelViewProjectionMatrix * offset;
EmitVertex();
offset = vec4(cos(leftAngle) * downRadius, i, -sin(leftAngle) * downRadius, 0.0);
gl_Position = gl_in[0].gl_Position + viewProjectionMatrix * offset;
gl_Position = gl_in[0].gl_Position + modelViewProjectionMatrix * offset;
EmitVertex();
offset = vec4(cos(leftAngle) * upRadius, i + step, -sin(leftAngle) * upRadius, 0.0);
gl_Position = gl_in[0].gl_Position + viewProjectionMatrix * offset;
gl_Position = gl_in[0].gl_Position + modelViewProjectionMatrix * offset;
EmitVertex();
EndPrimitive();

42
graphics.cc
View File

@ -278,18 +278,16 @@ void Graphics::render(double time)
level->render(lightingShader, true, &lightingViewProjectionMatrix, &depthBiasVPs);
// draw flames on top
flameShader->use();
// cull faces to get consistent color while using alpha
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
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();
// draw with colors
flameShader->setUniform("viewProjectionMatrix", lightingViewProjectionMatrix);
flameShader->setUniform("modelViewProjectionMatrix", lightingViewProjectionMatrix);
flameShader->setUniform("withColor", true);
flameShader->setUniform("time", (float) time);
flameShader->setUniform("bottom", true);
flameShader->setUniform("left", true);
@ -302,10 +300,36 @@ void Graphics::render(double time)
flameShader->setUniform("left", false);
flame_positions->render();
glDisable(GL_CULL_FACE);
glDepthMask(GL_FALSE);
// draw slightly larger only for stencil buffer to blur edges
glEnable(GL_STENCIL_TEST);
glStencilFunc(GL_ALWAYS, 1, 0xFF); //Set any stencil to 1
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
glStencilMask(0xFF);//write to stencil buffer
glClear(GL_STENCIL_BUFFER_BIT);//clear stencil buffer
glm::mat4 modelMatrix = glm::scale(glm::vec3(1.1f));
flameShader->setUniform("viewProjectionMatrix", lightingViewProjectionMatrix);
flameShader->setUniform("modelViewProjectionMatrix", lightingViewProjectionMatrix * modelMatrix);
flameShader->setUniform("withColor", false);
flameShader->setUniform("time", (float) time);
flameShader->setUniform("bottom", true);
flameShader->setUniform("left", true);
flame_positions->render();
flameShader->setUniform("left", false);
flame_positions->render();
flameShader->setUniform("bottom", false);
flameShader->setUniform("left", true);
flame_positions->render();
flameShader->setUniform("left", false);
flame_positions->render();
glStencilFunc(GL_EQUAL, 1, 0xFF); //Pass test if stencil value is 1
glStencilMask(0x00); //don't write to stencil buffer
glStencilMask(0x00);// don't write to stencil buffer
glDepthMask(GL_TRUE);
glDisable(GL_CULL_FACE);
flamePostShader->use();
fullscreen_quad->render();