Added pause toggle (press "p")

Author: SaschaWillems

computeShader/computeShaderParticleSystem/glRenderer.cpp

@@ -344,14 +344,13 @@ void glRenderer::renderScene()
 	float destPosY = (float)((windowHeight - cursorY) / windowHeight - 0.5f) * 2.0f;
 
 	glUseProgram(computeshader);
-	glUniform1f(glGetUniformLocation(computeshader, "deltaT"), frameDelta * speedMultiplier);
+	glUniform1f(glGetUniformLocation(computeshader, "deltaT"), frameDelta * speedMultiplier * (pause ? 0.0f : 1.0f));
 	glUniform3f(glGetUniformLocation(computeshader, "destPos"), destPosX, destPosY, 0);
 	glUniform2f(glGetUniformLocation(computeshader, "vpDim"), 1, 1);
 	glUniform1i(glGetUniformLocation(computeshader, "borderClamp"), (int)borderEnabled);
 
 	int workingGroups = particleCount / 16;
 
-
 	glDispatchCompute(workingGroups, 1, 1);
 
 	glUseProgram(0);
@@ -395,6 +394,8 @@ void glRenderer::keyCallback(int key, int scancode, int action, int mods)
 		borderEnabled = !borderEnabled;
 	if (key == GLFW_KEY_C && action == GLFW_PRESS)
 		colorFade = !colorFade;
+	if (key == GLFW_KEY_P && action == GLFW_PRESS)
+		pause = !pause;
 	if (key == GLFW_KEY_PAGE_UP && action == GLFW_PRESS)
 	{
 		particleCount += 1024;

computeShader/computeShaderParticleSystem/glRenderer.h

@@ -15,6 +15,7 @@ class glRenderer
 	float speedMultiplier = 0.15f;
 	bool borderEnabled = true;
 	bool colorFade = false;
+	bool pause = false;
 	float color[3];
 	float colVec[3];
 	float colorChangeTimer;

computeShader/computeShaderParticleSystem/main.cpp

@@ -102,6 +102,7 @@ int main(void)
 
 	printf("\nKeys:\n");
 	printf("""r"" : reset particles at current cursor pos\n");
+	printf("""p"" : Toggle pause\n");
 	printf("""b"" : toggle viewport border for particle movement\n");
 	printf("""c"" : toggle random color fade\n");
 	printf("""+"" : increase speed\n");