UnrealXR/raylib
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

[example] Review shaders_spotlight to work on GLSL 100

Browse source
This commit is contained in:
raysan5 2020-03-25 18:39:21 +01:00
parent 2dbcef218c
commit 74339b9fdc
3 changed files with 44 additions and 45 deletions
Download patch file Download diff file Expand all files Collapse all files

38
examples/shaders/resources/shaders/glsl100/spotlight.fs
View file

@ -4,7 +4,6 @@ precision mediump float;
#define MAX_SPOTS 3 #define MAX_SPOTS 3
struct Spot { struct Spot {
vec2 pos; // window coords of spot vec2 pos; // window coords of spot
float inner; // inner fully transparent centre radius float inner; // inner fully transparent centre radius
@ -16,21 +15,21 @@ uniform float screenWidth; // Width of the screen
void main() void main()
{ {
float alpha = 1.0; float alpha = 1.0;
// get the position of the current fragment (screen coordinates!)
// Get the position of the current fragment (screen coordinates!)
vec2 pos = vec2(gl_FragCoord.x, gl_FragCoord.y); vec2 pos = vec2(gl_FragCoord.x, gl_FragCoord.y);
// Find out which spotlight is nearest
// find out which spotlight is nearest
float d = 65000.0; // some high value float d = 65000.0; // some high value
int fi = -1; int fi = -1; // found index
for (int i = 0; i < MAX_SPOTS; i++) for (int i = 0; i < MAX_SPOTS; i++)
{ {
for (int j = 0; j < MAX_SPOTS; j++) for (int j = 0; j < MAX_SPOTS; j++)
{ {
float dj = distance(pos, spots[j].pos) - spots[j].radius + spots[i].radius; float dj = distance(pos, spots[j].pos) - spots[j].radius + spots[i].radius;
if (d > dj) if (d > dj)
{ {
d = dj; d = dj;
@ -41,23 +40,32 @@ void main()
// d now equals distance to nearest spot... // d now equals distance to nearest spot...
// allowing for the different radii of all spotlights // allowing for the different radii of all spotlights
if (fi != -1) { if (fi == 0)
if (d > spots[fi].radius)
{ {
alpha = 1.0; if (d > spots[0].radius) alpha = 1.0;
}
else else
{ {
if (d < spots[fi].inner) if (d < spots[0].inner) alpha = 0.0;
{ else alpha = (d - spots[0].inner)/(spots[0].radius - spots[0].inner);
alpha = 0.0;
} }
}
else if (fi == 1)
{
if (d > spots[1].radius) alpha = 1.0;
else else
{ {
alpha = (d - spots[fi].inner) / (spots[fi].radius - spots[fi].inner); if (d < spots[1].inner) alpha = 0.0;
else alpha = (d - spots[1].inner)/(spots[1].radius - spots[1].inner);
} }
} }
else if (fi == 2)
{
if (d > spots[2].radius) alpha = 1.0;
else
{
if (d < spots[2].inner) alpha = 0.0;
else alpha = (d - spots[2].inner)/(spots[2].radius - spots[2].inner);
}
} }
// Right hand side of screen is dimly lit, // Right hand side of screen is dimly lit,

19
examples/shaders/resources/shaders/glsl330/spotlight.fs
View file

@ -25,7 +25,6 @@ void main()
float alpha = 1.0; float alpha = 1.0;
// Get the position of the current fragment (screen coordinates!) // Get the position of the current fragment (screen coordinates!)
vec2 pos = vec2(gl_FragCoord.x, gl_FragCoord.y); vec2 pos = vec2(gl_FragCoord.x, gl_FragCoord.y);
// Find out which spotlight is nearest // Find out which spotlight is nearest
@ -37,6 +36,7 @@ void main()
for (int j = 0; j < MAX_SPOTS; j++) for (int j = 0; j < MAX_SPOTS; j++)
{ {
float dj = distance(pos, spots[j].pos) - spots[j].radius + spots[i].radius; float dj = distance(pos, spots[j].pos) - spots[j].radius + spots[i].radius;
if (d > dj) if (d > dj)
{ {
d = dj; d = dj;
@ -47,22 +47,13 @@ void main()
// d now equals distance to nearest spot... // d now equals distance to nearest spot...
// allowing for the different radii of all spotlights // allowing for the different radii of all spotlights
if (fi != -1) { if (fi != -1)
if (d > spots[fi].radius)
{ {
alpha = 1.0; if (d > spots[fi].radius) alpha = 1.0;
}
else else
{ {
if (d < spots[fi].inner) if (d < spots[fi].inner) alpha = 0.0;
{ else alpha = (d - spots[fi].inner) / (spots[fi].radius - spots[fi].inner);
alpha = 0.0;
}
else
{
alpha = (d - spots[fi].inner) / (spots[fi].radius - spots[fi].inner);
}
} }
} }

BIN
examples/shaders/shaders_spotlight.png Normal file
View file

Binary file not shown.
Side by side

After

Width:  |  Height:  |  Size: 118 KiB