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Make the fluid sample do a splat on startup

This commit is contained in:
Ilia Demianenko 2023-10-03 21:19:36 -07:00
parent 6e4943c2fa
commit c05223f91c
1 changed files with 45 additions and 10 deletions
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55
samples/fluid/src/main.c
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@ -140,6 +140,7 @@ frame_buffer divBuffer[4];
GLuint vertexBuffer; GLuint vertexBuffer;
oc_surface surface; oc_surface surface;
f64 startTime;
//---------------------------------------------------------------- //----------------------------------------------------------------
//NOTE(martin): initialization //NOTE(martin): initialization
@ -403,6 +404,7 @@ typedef struct mouse_input
} mouse_input; } mouse_input;
mouse_input mouseInput = { 0 }; mouse_input mouseInput = { 0 };
bool mouseWasDown = false;
int frameWidth = 800; int frameWidth = 800;
int frameHeight = 600; int frameHeight = 600;
@ -410,6 +412,7 @@ int frameHeight = 600;
ORCA_EXPORT void oc_on_mouse_down(int button) ORCA_EXPORT void oc_on_mouse_down(int button)
{ {
mouseInput.down = true; mouseInput.down = true;
mouseWasDown = true;
} }
ORCA_EXPORT void oc_on_mouse_up(int button) ORCA_EXPORT void oc_on_mouse_up(int button)
@ -577,23 +580,56 @@ void multigrid_clear(frame_buffer* error)
void input_splat(float t) void input_splat(float t)
{ {
//NOTE: apply force and dye bool applySplat = false;
if(mouseInput.down && (mouseInput.deltaX || mouseInput.deltaY)) float x, y, deltaX, deltaY;
if (mouseInput.down && (mouseInput.deltaX || mouseInput.deltaY))
{ {
oc_vec2 scaling = oc_surface_contents_scaling(surface); oc_vec2 scaling = oc_surface_contents_scaling(surface);
applySplat = true;
x = mouseInput.x * scaling.x / frameWidth;
y = mouseInput.y * scaling.y / frameHeight;
deltaX = mouseInput.deltaX * scaling.x / frameWidth;
deltaY = mouseInput.deltaY * scaling.y / frameHeight;
mouseInput.deltaX = 0;
mouseInput.deltaY = 0;
}
f64 now = oc_clock_time(OC_CLOCK_MONOTONIC);
f64 timeSinceStart = now - startTime;
if (!mouseWasDown && timeSinceStart < 1)
{
applySplat = true;
float totalDeltaX = 0.5;
x = 0.1 + totalDeltaX * timeSinceStart;
y = 0.5;
static f64 lastFrameTime = 0;
if (lastFrameTime == 0)
{
lastFrameTime = startTime;
}
deltaX = totalDeltaX * (now - lastFrameTime) / 3;
deltaY = 0;
lastFrameTime = now;
}
//NOTE: apply force and dye
if(applySplat)
{
// account for margin // account for margin
float margin = 32; float margin = 32;
float offset = margin / texWidth; float offset = margin / texWidth;
float ratio = 1 - 2 * margin / texWidth; float ratio = 1 - 2 * margin / texWidth;
float splatPosX = (mouseInput.x * scaling.x / frameWidth) * ratio + offset; float splatPosX = x * ratio + offset;
float splatPosY = (1 - mouseInput.y * scaling.y / frameHeight) * ratio + offset; float splatPosY = (1 - y) * ratio + offset;
float splatVelX = (10000. * DELTA * mouseInput.deltaX * scaling.x / frameWidth) * ratio; float splatVelX = (10000. * DELTA * deltaX) * ratio;
float splatVelY = (-10000. * DELTA * mouseInput.deltaY * scaling.y / frameWidth) * ratio; float splatVelY = (-10000. * DELTA * deltaY) * ratio;
float intensity = 100 * sqrtf(square(ratio * mouseInput.deltaX * scaling.x / frameWidth) + square(ratio * mouseInput.deltaY * scaling.y / frameHeight)); float intensity = 100 * sqrtf(square(ratio * deltaX) + square(ratio * deltaY));
float r = intensity * (sinf(2 * M_PI * 0.1 * t) + 1); float r = intensity * (sinf(2 * M_PI * 0.1 * t) + 1);
float g = 0.5 * intensity * (cosf(2 * M_PI * 0.1 / M_E * t + 654) + 1); float g = 0.5 * intensity * (cosf(2 * M_PI * 0.1 / M_E * t + 654) + 1);
@ -602,9 +638,6 @@ void input_splat(float t)
float radius = 0.005; float radius = 0.005;
apply_splat(splatPosX, splatPosY, radius, splatVelX, splatVelY, r, g, b, false); apply_splat(splatPosX, splatPosY, radius, splatVelX, splatVelY, r, g, b, false);
mouseInput.deltaX = 0;
mouseInput.deltaY = 0;
} }
} }
@ -677,6 +710,8 @@ ORCA_EXPORT void oc_on_init()
testDiv[i][j][0] = 0.5 + 0.5 * cosf(j / 100. * 3.14159 + i / 100. * 1.2139); testDiv[i][j][0] = 0.5 + 0.5 * cosf(j / 100. * 3.14159 + i / 100. * 1.2139);
} }
} }
startTime = oc_clock_time(OC_CLOCK_MONOTONIC);
} }
ORCA_EXPORT void oc_on_resize(u32 width, u32 height) ORCA_EXPORT void oc_on_resize(u32 width, u32 height)