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// Copyright (C) 2009 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma version(1)
#pragma stateVertex(PVBackground)
#pragma stateFragment(PFBackground)
#pragma stateFragmentStore(PFSBackground)
#define RSID_STATE 0
#define RSID_FRAME_COUNT 0
#define RSID_BLADES_COUNT 1
#define RSID_WIDTH 2
#define RSID_HEIGHT 3
#define RSID_BLADES 1
#define BLADE_STRUCT_FIELDS_COUNT 12
#define BLADE_STRUCT_ANGLE 0
#define BLADE_STRUCT_SIZE 1
#define BLADE_STRUCT_XPOS 2
#define BLADE_STRUCT_YPOS 3
#define BLADE_STRUCT_OFFSET 4
#define BLADE_STRUCT_SCALE 5
#define BLADE_STRUCT_LENGTHX 6
#define BLADE_STRUCT_LENGTHY 7
#define BLADE_STRUCT_HARDNESS 8
#define BLADE_STRUCT_H 9
#define BLADE_STRUCT_S 10
#define BLADE_STRUCT_B 11
#define TESSELATION 2.0f
#define MAX_BEND 0.09f
#define MIDNIGHT 0.0f
#define MORNING 0.375f
#define AFTERNOON 0.6f
#define DUSK 0.8f
#define SECONDS_IN_DAY 24.0f * 3600.0f
#define PI 3.1415926f
#define REAL_TIME 0
float time(int frameCount) {
if (REAL_TIME) {
return (hour() * 3600.0f + minute() * 60.0f + second()) / SECONDS_IN_DAY;
}
return (frameCount % 180) / 180.0f;
}
void alpha(float a) {
color(1.0f, 1.0f, 1.0f, a);
}
void drawNight(int width, int height) {
bindProgramFragment(NAMED_PFNight);
bindTexture(NAMED_PFNight, 0, NAMED_TNight);
drawQuadTexCoords(
0.0f, -32.0f, 0.0f,
0.0f, 1.0f,
width, -32.0f, 0.0f,
2.0f, 1.0f,
width, 1024.0f - 32.0f, 0.0f,
2.0f, 0.0f,
0.0f, 1024.0f - 32.0f, 0.0f,
0.0f, 0.0f);
bindProgramFragment(NAMED_PFBackground);
}
void drawSunrise(int width, int height) {
bindTexture(NAMED_PFBackground, 0, NAMED_TSunrise);
drawRect(0.0f, 0.0f, width, height, 0.0f);
}
void drawNoon(int width, int height) {
bindTexture(NAMED_PFBackground, 0, NAMED_TSky);
drawRect(0.0f, 0.0f, width, height, 0.0f);
}
void drawSunset(int width, int height) {
bindTexture(NAMED_PFBackground, 0, NAMED_TSunset);
drawRect(0.0f, 0.0f, width, height, 0.0f);
}
void drawBlade(int index, float now, int frameCount) {
float *bladeStruct = loadArrayF(RSID_BLADES, index);
float offset = bladeStruct[BLADE_STRUCT_OFFSET];
float scale = bladeStruct[BLADE_STRUCT_SCALE];
float angle = bladeStruct[BLADE_STRUCT_ANGLE];
float hardness = bladeStruct[BLADE_STRUCT_HARDNESS];
float xpos = bladeStruct[BLADE_STRUCT_XPOS];
float ypos = bladeStruct[BLADE_STRUCT_YPOS];
float lengthX = bladeStruct[BLADE_STRUCT_LENGTHX];
float lengthY = bladeStruct[BLADE_STRUCT_LENGTHY];
int size = bladeStruct[BLADE_STRUCT_SIZE];
float h = bladeStruct[BLADE_STRUCT_H];
float s = bladeStruct[BLADE_STRUCT_S];
float b = bladeStruct[BLADE_STRUCT_B];
float newB = 1.0f;
if (now >= MIDNIGHT && now < MORNING) {
newB = now / MORNING;
}
if (now >= AFTERNOON && now < DUSK) {
newB = 1.0f - normf(AFTERNOON, DUSK, now);
}
if (now >= DUSK) {
newB = 0.0f;
}
hsb(h, s, lerpf(0, b, newB), 1.0f);
float newAngle = turbulencef2(xpos * 0.006f, frameCount * 0.006f, 4.0f) - 0.5f;
newAngle /= 2.0f;
angle = clampf(angle + (newAngle + offset - angle) * 0.15f, -MAX_BEND, MAX_BEND);
float currentAngle = PI / 2.0f;
float bottomX = xpos;
float bottomY = ypos;
int i = size * TESSELATION;
float lx = lengthX / TESSELATION;
float ly = lengthY / TESSELATION;
float ss = 4.0f / i + scale / TESSELATION;
float sh = 0.5f / TESSELATION;
float d = angle * hardness / TESSELATION;
for ( ; i > 0; i--) {
float topX = bottomX - cosf(currentAngle) * size * lx;
float topY = bottomY - sinf(currentAngle) * size * ly;
currentAngle += d;
float spi = (i - 1) * ss;
float si = i * ss;
drawQuad(topX + spi, topY, 0.0f,
topX - spi, topY, 0.0f,
bottomX - si, bottomY + sh, 0.0f,
bottomX + si, bottomY + sh, 0.0f);
bottomX = topX;
bottomY = topY;
}
storeF(RSID_BLADES, index + BLADE_STRUCT_ANGLE, angle);
}
void drawBlades(float now, int frameCount) {
// For anti-aliasing
bindTexture(NAMED_PFBackground, 0, NAMED_TAa);
int bladesCount = loadI32(RSID_STATE, RSID_BLADES_COUNT);
int count = bladesCount * BLADE_STRUCT_FIELDS_COUNT;
int i = 0;
for ( ; i < count; i += BLADE_STRUCT_FIELDS_COUNT) {
drawBlade(i, now, frameCount);
}
}
int main(int launchID) {
int width = loadI32(RSID_STATE, RSID_WIDTH);
int height = loadI32(RSID_STATE, RSID_HEIGHT);
int frameCount = loadI32(RSID_STATE, RSID_FRAME_COUNT);
float now = time(frameCount);
alpha(1.0f);
if (now >= MIDNIGHT && now < MORNING) {
drawNight(width, height);
alpha(normf(MIDNIGHT, MORNING, now));
drawSunrise(width, height);
} else if (now >= MORNING && now < AFTERNOON) {
drawSunrise(width, height);
alpha(normf(MORNING, AFTERNOON, now));
drawNoon(width, height);
} else if (now >= AFTERNOON && now < DUSK) {
drawNoon(width, height);
alpha(normf(AFTERNOON, DUSK, now));
drawSunset(width, height);
} else if (now >= DUSK) {
drawNight(width, height);
alpha(1.0f - normf(DUSK, 1.0f, now));
drawSunset(width, height);
}
drawBlades(now, frameCount);
frameCount++;
storeI32(RSID_STATE, RSID_FRAME_COUNT, frameCount);
return 1;
}
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