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#pragma version(1)
#pragma rs java_package_name(com.android.galaxy4)
#include "rs_graphics.rsh"
#pragma stateVertex(parent);
#pragma stateStore(parent);
typedef struct __attribute__((packed, aligned(4))) Particle {
float3 position;
float pointSize;
} Particle_t;
typedef struct VpConsts {
rs_matrix4x4 MVP;
float scaleSize;
} VpConsts_t;
VpConsts_t *vpConstants;
Particle_t *spaceClouds;
Particle_t *bgStars;
Particle_t *staticStars;
rs_mesh spaceCloudsMesh;
rs_mesh bgStarsMesh;
rs_mesh staticStarsMesh;
rs_program_vertex vertSpaceClouds;
rs_program_vertex vertBgStars;
rs_program_vertex vertStaticStars;
rs_program_fragment fragSpaceClouds;
rs_program_fragment fragBgStars;
rs_program_fragment fragStaticStars;
rs_program_vertex vertBg;
rs_program_fragment fragBg;
rs_allocation textureSpaceCloud;
rs_allocation textureStaticStar;
rs_allocation textureStaticStar2;
rs_allocation textureBg;
float densityDPI;
static int gGalaxyRadius = 300;
static float screenWidth;
static float screenHeight;
static int numBgStars;
static int numClouds;
static int numStaticStars;
#define PI 3.1415f
#define TWO_PI 6.283f
/**
* Helper function to generate the stars.
*/
static float randomGauss() {
float x1;
float x2;
float w = 2.f;
while (w >= 1.0f) {
x1 = rsRand(2.0f) - 1.0f;
x2 = rsRand(2.0f) - 1.0f;
w = x1 * x1 + x2 * x2;
}
w = sqrt(-2.0f * log(w) / w);
return x1 * w;
}
static float mapf(float minStart, float minStop, float maxStart, float maxStop, float value) {
return maxStart + (maxStart - maxStop) * ((value - minStart) / (minStop - minStart));
}
void positionParticles() {
screenWidth = rsgGetWidth();
screenHeight = rsgGetHeight();
float wRatio = 1.0f;
float hRatio = 1.0f;
if (screenWidth > screenHeight) {
wRatio = screenWidth/screenHeight;
screenHeight = screenWidth;
} else {
hRatio = screenHeight/screenWidth;
screenWidth = screenHeight;
}
float scale = gGalaxyRadius / (screenWidth * 0.5f);
// clouds
Particle_t* particle = spaceClouds;
numClouds = rsAllocationGetDimX(rsGetAllocation(spaceClouds));
for (int i=0; i<numClouds; i++) {
float d = fabs(randomGauss()) * gGalaxyRadius * 0.5f + rsRand(64.0f);
d = mapf(-4.0f, gGalaxyRadius + 4.0f, 0.0f, scale, d);
float id = d / gGalaxyRadius;
float z = randomGauss() * 0.4f * (1.0f - id);
if (d > gGalaxyRadius * 0.15f) {
z *= 0.6f * (1.0f - id);
} else {
z *= 0.72f;
}
particle->position.x = rsRand(TWO_PI);
particle->position.y = d;
particle->pointSize = 1.0f;
particle->position.z = z/5.0f;
particle++;
}
// bg stars
numBgStars = rsAllocationGetDimX(rsGetAllocation(bgStars));
particle = bgStars;
for (int i=0; i<numBgStars; i++) {
float d = fabs(randomGauss()) * gGalaxyRadius * 0.5f + rsRand(64.0f);
d = mapf(-4.0f, gGalaxyRadius + 4.0f, 0.0f, scale, d);
float id = d / gGalaxyRadius;
float z = randomGauss() * 0.4f * (1.0f - id);
if (d > gGalaxyRadius * 0.15f) {
z *= 0.6f * (1.0f - id);
} else {
z *= 0.72f;
}
particle->position.x = rsRand(TWO_PI);
particle->position.y = d;
particle->pointSize = 1.0f;
particle->position.z = z/5.0f;
particle++;
}
// static stars
numStaticStars = rsAllocationGetDimX(rsGetAllocation(staticStars));
particle = staticStars;
for (int i=0; i<numStaticStars; i++) {
particle->position.x = rsRand(-wRatio, wRatio);
particle->position.y = rsRand(-hRatio, hRatio);
particle->pointSize = rsRand(1.0f, 10.0f);
particle++;
}
}
int root() {
float xpos = 0.0f;
float ypos = 0.0f;
xpos = -(screenWidth-rsgGetWidth())/2.0f;
ypos = -(screenHeight-rsgGetHeight())/2.0f;
rsgClearColor(0.0f, 0.f, 0.f, 0.5f);
// bg
rsgBindProgramVertex(vertBg);
rsgBindProgramFragment(fragBg);
rsgBindTexture(fragBg, 0, textureBg);
rsgDrawRect(xpos, ypos, screenWidth+xpos, screenHeight+ypos, 0.0f);
// space cloud
rsgBindProgramVertex(vertSpaceClouds);
Particle_t *particle = spaceClouds;
for (int i=0; i<numClouds; i++) {
particle->position.x -= .065;
particle++;
}
rsgBindProgramFragment(fragSpaceClouds);
rsgBindTexture(fragSpaceClouds, 0, textureSpaceCloud);
rsgDrawMesh(spaceCloudsMesh);
// bg stars
rsgBindProgramVertex(vertBgStars);
particle = bgStars;
for (int i=0; i<numBgStars; i++) {
particle->position.x -= .007;
particle++;
}
rsgBindProgramFragment(fragBgStars);
rsgDrawMesh(bgStarsMesh);
// static stars
rsgBindTexture(fragStaticStars, 0, textureStaticStar);
rsgBindTexture(fragStaticStars, 1, textureStaticStar2);
rsgBindProgramVertex(vertStaticStars);
rsgBindProgramFragment(fragStaticStars);
rsgDrawMesh(staticStarsMesh);
return 40;
}
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