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raysan5 2020-12-23 20:30:00 +01:00
parent 10a57f297e
commit d9a9bacb48
3 changed files with 122 additions and 126 deletions
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190
examples/shaders/shaders_spotlight.c
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@ -39,10 +39,8 @@
#define GLSL_VERSION 100
#endif
#define MAXSPOT 3 // NB must be the same as define in shader
#define numStars 400
#define MAX_SPOTS 3 // NOTE: It must be the same as define in shader
#define MAX_STARS 400
// Spot data
typedef struct {
@ -78,76 +76,67 @@ int main(void)
Texture texRay = LoadTexture("resources/raysan.png");
Star stars[numStars] = { 0 };
Star stars[MAX_STARS] = { 0 };
for (int n = 0; n < numStars; n++) ResetStar(&stars[n]);
for (int n = 0; n < MAX_STARS; n++) ResetStar(&stars[n]);
// Progress all the stars on, so they don't all start in the centre
for (int m = 0; m < screenWidth/2.0; m++)
{
for (int n = 0; n < numStars; n++) UpdateStar(&stars[n]);
for (int n = 0; n < MAX_STARS; n++) UpdateStar(&stars[n]);
}
int frameCounter = 0;
// Use default vert shader
Shader spotShader = LoadShader(0, TextFormat("resources/shaders/glsl%i/spotlight.fs", GLSL_VERSION));
Shader shdrSpot = LoadShader(0, TextFormat("resources/shaders/glsl%i/spotlight.fs", GLSL_VERSION));
// Get the locations of spots in the shader
Spot spots[MAXSPOT];
/*
unsigned int posLoc;
unsigned int innerLoc;
unsigned int radiusLoc;
*/
for (int i = 0; i < MAXSPOT; i++)
{
char posName[32] = "spots[x].pos\0";
char innerName[32] = "spots[x].inner\0";
char radiusName[32] = "spots[x].radius\0";
// Get the locations of spots in the shader
Spot spots[MAX_SPOTS];
posName[6] = '0' + i;
innerName[6] = '0' + i;
radiusName[6] = '0' + i;
spots[i].posLoc = GetShaderLocation(spotShader, posName);
spots[i].innerLoc = GetShaderLocation(spotShader, innerName);
spots[i].radiusLoc = GetShaderLocation(spotShader, radiusName);
}
// tell the shader how wide the screen is so we can have
// a pitch black half and a dimly lit half.
{
unsigned int wLoc = GetShaderLocation(spotShader, "screenWidth");
float sw = (float)GetScreenWidth();
SetShaderValue(spotShader, wLoc, &sw, UNIFORM_FLOAT);
}
// randomise the locations and velocities of the spotlights
// and initialise the shader locations
for (int i = 0; i < MAXSPOT; i++)
for (int i = 0; i < MAX_SPOTS; i++)
{
spots[i].pos.x = GetRandomValue(64, screenWidth - 64);
spots[i].pos.y = GetRandomValue(64, screenHeight - 64);
spots[i].vel = (Vector2){ 0, 0 };
char posName[32] = "spots[x].pos\0";
char innerName[32] = "spots[x].inner\0";
char radiusName[32] = "spots[x].radius\0";
posName[6] = '0' + i;
innerName[6] = '0' + i;
radiusName[6] = '0' + i;
while ((fabs(spots[i].vel.x) + fabs(spots[i].vel.y)) < 2)
spots[i].posLoc = GetShaderLocation(shdrSpot, posName);
spots[i].innerLoc = GetShaderLocation(shdrSpot, innerName);
spots[i].radiusLoc = GetShaderLocation(shdrSpot, radiusName);
}
// Tell the shader how wide the screen is so we can have
// a pitch black half and a dimly lit half.
unsigned int wLoc = GetShaderLocation(shdrSpot, "screenWidth");
float sw = (float)GetScreenWidth();
SetShaderValue(shdrSpot, wLoc, &sw, UNIFORM_FLOAT);
// Randomise the locations and velocities of the spotlights
// and initialise the shader locations
for (int i = 0; i < MAX_SPOTS; i++)
{
spots[i].pos.x = GetRandomValue(64, screenWidth - 64);
spots[i].pos.y = GetRandomValue(64, screenHeight - 64);
spots[i].vel = (Vector2){ 0, 0 };
while ((fabs(spots[i].vel.x) + fabs(spots[i].vel.y)) < 2)
{
spots[i].vel.x = GetRandomValue(-40, 40)/10.0;
spots[i].vel.y = GetRandomValue(-40, 40)/10.0;
}
spots[i].inner = 28 * (i + 1);
spots[i].radius = 48 * (i + 1);
SetShaderValue(spotShader, spots[i].posLoc, &spots[i].pos.x, UNIFORM_VEC2);
SetShaderValue(spotShader, spots[i].innerLoc, &spots[i].inner, UNIFORM_FLOAT);
SetShaderValue(spotShader, spots[i].radiusLoc, &spots[i].radius, UNIFORM_FLOAT);
}
spots[i].vel.x = GetRandomValue(-40, 40)/10.0;
spots[i].vel.y = GetRandomValue(-40, 40)/10.0;
}
spots[i].inner = 28 * (i + 1);
spots[i].radius = 48 * (i + 1);
SetShaderValue(shdrSpot, spots[i].posLoc, &spots[i].pos.x, UNIFORM_VEC2);
SetShaderValue(shdrSpot, spots[i].innerLoc, &spots[i].inner, UNIFORM_FLOAT);
SetShaderValue(shdrSpot, spots[i].radiusLoc, &spots[i].radius, UNIFORM_FLOAT);
}
SetTargetFPS(60); // Set to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
@ -159,39 +148,42 @@ int main(void)
//----------------------------------------------------------------------------------
frameCounter++;
// Move the stars, resetting them if the go offscreen
for (int n = 0; n < numStars; n++) UpdateStar(&stars[n]);
// Move the stars, resetting them if the go offscreen
for (int n = 0; n < MAX_STARS; n++) UpdateStar(&stars[n]);
// Update the spots, send them to the shader
for (int i = 0; i < MAXSPOT; i++)
// Update the spots, send them to the shader
for (int i = 0; i < MAX_SPOTS; i++)
{
if ( i == 0 ) {
Vector2 mp = GetMousePosition();
spots[i].pos.x = mp.x;
spots[i].pos.y = screenHeight - mp.y;
} else {
spots[i].pos.x += spots[i].vel.x;
spots[i].pos.y += spots[i].vel.y;
if (spots[i].pos.x < 64) spots[i].vel.x = -spots[i].vel.x;
if (spots[i].pos.x > screenWidth - 64) spots[i].vel.x = -spots[i].vel.x;
if (spots[i].pos.y < 64) spots[i].vel.y = -spots[i].vel.y;
if (spots[i].pos.y > screenHeight - 64) spots[i].vel.y = -spots[i].vel.y;
}
SetShaderValue(spotShader, spots[i].posLoc, &spots[i].pos.x, UNIFORM_VEC2);
}
if (i == 0)
{
Vector2 mp = GetMousePosition();
spots[i].pos.x = mp.x;
spots[i].pos.y = screenHeight - mp.y;
}
else
{
spots[i].pos.x += spots[i].vel.x;
spots[i].pos.y += spots[i].vel.y;
if (spots[i].pos.x < 64) spots[i].vel.x = -spots[i].vel.x;
if (spots[i].pos.x > (screenWidth - 64)) spots[i].vel.x = -spots[i].vel.x;
if (spots[i].pos.y < 64) spots[i].vel.y = -spots[i].vel.y;
if (spots[i].pos.y > (screenHeight - 64)) spots[i].vel.y = -spots[i].vel.y;
}
SetShaderValue(shdrSpot, spots[i].posLoc, &spots[i].pos.x, UNIFORM_VEC2);
}
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(DARKBLUE);
// Draw stars and bobs
for (int n = 0; n < numStars; n++)
// Draw stars and bobs
for (int n = 0; n < MAX_STARS; n++)
{
// Single pixel is just too small these days!
// Single pixel is just too small these days!
DrawRectangle(stars[n].pos.x, stars[n].pos.y, 2, 2, WHITE);
}
@ -199,24 +191,23 @@ int main(void)
{
DrawTexture(texRay,
(screenWidth/2.0) + cos((frameCounter + i*8)/51.45f)*(screenWidth/2.2) - 32,
(screenHeight/2.0) + sin((frameCounter + i*8)/17.87f)*(screenHeight/4.2),
WHITE);
(screenHeight/2.0) + sin((frameCounter + i*8)/17.87f)*(screenHeight/4.2), WHITE);
}
// Draw spot lights
BeginShaderMode(spotShader);
// instead of a blank rectangle you could render here
// a render texture of the full screen used to do screen
// scaling (slight adjustment to shader would be required
// to actually pay attention to the colour!)
DrawRectangle(0,0,screenWidth,screenHeight,WHITE);
EndShaderMode();
// Draw spot lights
BeginShaderMode(shdrSpot);
// Instead of a blank rectangle you could render here
// a render texture of the full screen used to do screen
// scaling (slight adjustment to shader would be required
// to actually pay attention to the colour!)
DrawRectangle(0, 0, screenWidth, screenHeight, WHITE);
EndShaderMode();
DrawFPS(10, 10);
DrawText("Move the mouse!", 10, 30, 20, GREEN);
DrawText("Pitch Black", screenWidth * .2, screenHeight / 2, 20, GREEN);
DrawText("Dark", screenWidth * .66, screenHeight / 2, 20, GREEN);
DrawText("Pitch Black", screenWidth*0.2f, screenHeight/2, 20, GREEN);
DrawText("Dark", screenWidth*.66f, screenHeight/2, 20, GREEN);
EndDrawing();
@ -226,6 +217,7 @@ int main(void)
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadTexture(texRay);
UnloadShader(shdrSpot);
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
@ -243,17 +235,17 @@ void ResetStar(Star *s)
s->vel.x = (float)GetRandomValue(-1000, 1000)/100.0f;
s->vel.y = (float)GetRandomValue(-1000, 1000)/100.0f;
} while (!(fabs(s->vel.x) + fabs(s->vel.y) > 1));
} while (!(fabs(s->vel.x) + (fabs(s->vel.y) > 1)));
s->pos = Vector2Add(s->pos, Vector2Multiply(s->vel, (Vector2){ 8, 8 }));
s->pos = Vector2Add(s->pos, Vector2Multiply(s->vel, (Vector2){ 8.0f, 8.0f }));
}
void UpdateStar(Star *s)
{
s->pos = Vector2Add(s->pos, s->vel);
if (s->pos.x < 0 || s->pos.x > GetScreenWidth() ||
s->pos.y < 0 || s->pos.y > GetScreenHeight())
if ((s->pos.x < 0) || (s->pos.x > GetScreenWidth()) ||
(s->pos.y < 0) || (s->pos.y > GetScreenHeight()))
{
ResetStar(s);
}