[Examples] Top down lights example (#2199)

* Start 2d lights example.

* finish example

* update image.

* Cleanup render textures

* Fixes to handle shadows on edges that are near to the light better.

* tabs

* move to shapes

Co-authored-by: Jeffery Myers <[email protected]>

5 files changed, 787 insertions, 1 deletions

diff --git a/examples/Makefile b/examples/Makefile
index ac1284f2..3d48bd77 100644
--- a/examples/Makefile
+++ b/examples/Makefile
@@ -411,7 +411,7 @@ SHAPES = \
     shapes/shapes_easings_rectangle_array \
     shapes/shapes_draw_ring \
     shapes/shapes_draw_circle_sector \
-    shapes/shapes_draw_rectangle_rounded
+    shapes/Sshapes_top_down_lights
 
 TEXTURES = \
     textures/textures_logo_raylib \
diff --git a/examples/shapes/shapes_top_down_lights.c b/examples/shapes/shapes_top_down_lights.c
new file mode 100644
index 00000000..d8cd5e62
--- /dev/null
+++ b/examples/shapes/shapes_top_down_lights.c
@@ -0,0 +1,380 @@
+/*******************************************************************************************
+*
+*   raylib [SHAPES] example - Top Down Lights
+*
+*   Welcome to raylib!
+*
+*   To test examples, just press F6 and execute raylib_compile_execute script
+*   Note that compiled executable is placed in the same folder as .c file
+*
+*   You can find all basic examples on C:\raylib\raylib\examples folder or
+*   raylib official webpage: www.raylib.com
+*
+*   Enjoy using raylib. :)
+*
+*   This example has been created using raylib 4.0 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2022 Jeffery Myers
+*
+********************************************************************************************/
+
+#include "raylib.h"
+#include "raymath.h"
+#include "rlgl.h"
+
+// Custom Blend Modes
+#define RLGL_SRC_ALPHA 0x0302
+#define RLGL_MIN 0x8007
+#define RLGL_MAX 0x8008
+
+#define MAX_BOXES 20
+
+typedef struct  
+{
+    Vector2 Vertecies[4];
+}ShadowGeometry;
+
+#define MAX_SHADOWS MAX_BOXES*3 // MAX_BOXES *3. Each box can cast up to two shadow volumes for the edges it is away from, and one for the box itself
+
+typedef struct 
+{
+    // is this light slot active
+    bool Active;
+
+    // does this light need to be updated
+    bool Dirty;
+
+    // is this light in a valid position
+    bool Valid;
+
+    // Light position
+    Vector2 Position;
+
+    // alpha mask for the light
+    RenderTexture Mask;
+
+    // the distance the light touches
+    float OuterRadius;
+
+    // a cached rectangle of the light bounds to help with culling
+    Rectangle Bounds;
+
+    ShadowGeometry Shadows[MAX_SHADOWS];
+    int ShadowCount;
+}LightInfo;
+
+#define MAX_LIGHTS 16
+LightInfo Lights[MAX_LIGHTS] = { 0 };
+
+// move a light and mark it as dirty so that we update it's mask next frame
+void MoveLight(int slot, float x, float y)
+{
+    Lights[slot].Dirty = true;
+    Lights[slot].Position.x = x; 
+    Lights[slot].Position.y = y;
+
+    // update the cached bounds
+    Lights[slot].Bounds.x = x - Lights[slot].OuterRadius;
+    Lights[slot].Bounds.y = y - Lights[slot].OuterRadius;
+}
+
+// compute a shadow volume for the edge
+// takes the edge and projects it back by the light radius and turns it into a quad
+void ComputeShadowVolumeForEdge(int slot, Vector2 sp, Vector2 ep)
+{
+    if (Lights[slot].ShadowCount >= MAX_SHADOWS)
+        return;
+
+    float extension = Lights[slot].OuterRadius*2;
+
+    Vector2 spVector = Vector2Normalize(Vector2Subtract(sp, Lights[slot].Position));
+    Vector2 spProjection = Vector2Add(sp, Vector2Scale(spVector, extension));
+
+    Vector2 epVector = Vector2Normalize(Vector2Subtract(ep, Lights[slot].Position));
+    Vector2 epProjection = Vector2Add(ep, Vector2Scale(epVector, extension));
+
+    Lights[slot].Shadows[Lights[slot].ShadowCount].Vertecies[0] = sp;
+    Lights[slot].Shadows[Lights[slot].ShadowCount].Vertecies[1] = ep;
+    Lights[slot].Shadows[Lights[slot].ShadowCount].Vertecies[2] = epProjection;
+    Lights[slot].Shadows[Lights[slot].ShadowCount].Vertecies[3] = spProjection;
+
+    Lights[slot].ShadowCount++;
+}
+
+// draw the light and shadows to the mask for a light
+void UpdateLightMask(int slot)
+{
+    // use the light mask
+    BeginTextureMode(Lights[slot].Mask);
+
+    ClearBackground(WHITE);
+
+    // force the blend mode to only set the alpha of the destination
+    rlSetBlendFactors(RLGL_SRC_ALPHA, RLGL_SRC_ALPHA, RLGL_MIN);
+    rlSetBlendMode(BLEND_CUSTOM);
+
+    // if we are valid, then draw the light radius to the alpha mask
+    if (Lights[slot].Valid)
+        DrawCircleGradient((int)Lights[slot].Position.x, (int)Lights[slot].Position.y, Lights[slot].OuterRadius, ColorAlpha(WHITE, 0), WHITE);
+    rlDrawRenderBatchActive();
+
+    // cut out the shadows from the light radius by forcing the alpha to maximum
+    rlSetBlendMode(BLEND_ALPHA);
+    rlSetBlendFactors(RLGL_SRC_ALPHA, RLGL_SRC_ALPHA, RLGL_MAX);
+    rlSetBlendMode(BLEND_CUSTOM);
+
+    // draw the shadows to the alpha mask
+    for (int i = 0; i < Lights[slot].ShadowCount; i++)
+    {
+        DrawTriangleFan(Lights[slot].Shadows[i].Vertecies, 4, WHITE);
+    }
+
+    rlDrawRenderBatchActive();
+    // go back to normal blend mode
+    rlSetBlendMode(BLEND_ALPHA);
+
+    EndTextureMode();
+}
+
+// setup a light
+void SetUpLight(int slot, float x, float y, float radius)
+{
+    Lights[slot].Active = true;
+    Lights[slot].Valid = false; // the light must prove it is valid
+    Lights[slot].Mask = LoadRenderTexture(GetScreenWidth(), GetScreenHeight());
+    Lights[slot].OuterRadius = radius;
+
+    Lights[slot].Bounds.width = radius * 2;
+    Lights[slot].Bounds.height = radius * 2;
+
+    MoveLight(slot, x, y);
+
+    // force the render texture to have something in it
+    UpdateLightMask(slot);
+}
+
+// see if a light needs to update it's mask
+bool UpdateLight(int slot, Rectangle* boxes, int count)
+{
+    if (!Lights[slot].Active || !Lights[slot].Dirty)
+        return false;
+
+    Lights[slot].Dirty = false;
+    Lights[slot].ShadowCount = 0;
+    Lights[slot].Valid = false;
+
+    for (int i = 0; i < count; i++)
+    {
+        // are we in a box, if so we are not valid
+        if (CheckCollisionPointRec(Lights[slot].Position, boxes[i]))
+            return false;
+
+        // if this box is outside our bounds, we can skip it
+        if (!CheckCollisionRecs(Lights[slot].Bounds, boxes[i]))
+            continue;
+
+        // check the edges that are on the same side we are, and cast shadow volumes out from them.
+        
+        // top
+        Vector2 sp = (Vector2){ boxes[i].x, boxes[i].y };
+        Vector2 ep = (Vector2){ boxes[i].x + boxes[i].width, boxes[i].y };
+
+        if (Lights[slot].Position.y > ep.y)    
+            ComputeShadowVolumeForEdge(slot, sp, ep);
+
+        // right
+        sp = ep;
+        ep.y += boxes[i].height;
+        if (Lights[slot].Position.x < ep.x)
+            ComputeShadowVolumeForEdge(slot, sp, ep);
+
+        // bottom
+        sp = ep;
+        ep.x -= boxes[i].width;
+        if (Lights[slot].Position.y < ep.y)
+            ComputeShadowVolumeForEdge(slot, sp, ep);
+
+        // left
+        sp = ep;
+        ep.y -= boxes[i].height;
+        if (Lights[slot].Position.x > ep.x)
+            ComputeShadowVolumeForEdge(slot, sp, ep);
+
+        // the box itself
+        Lights[slot].Shadows[Lights[slot].ShadowCount].Vertecies[0] = (Vector2){ boxes[i].x, boxes[i].y };
+        Lights[slot].Shadows[Lights[slot].ShadowCount].Vertecies[1] = (Vector2){ boxes[i].x, boxes[i].y + boxes[i].height };
+        Lights[slot].Shadows[Lights[slot].ShadowCount].Vertecies[2] = (Vector2){ boxes[i].x + boxes[i].width, boxes[i].y + boxes[i].height };
+        Lights[slot].Shadows[Lights[slot].ShadowCount].Vertecies[3] = (Vector2){ boxes[i].x + boxes[i].width, boxes[i].y };
+        Lights[slot].ShadowCount++;
+    }
+
+    Lights[slot].Valid = true;
+
+    UpdateLightMask(slot);
+
+    return true;
+}
+
+// set up some boxes
+void SetupBoxes(Rectangle* boxes, int *count)
+{
+    boxes[0] = (Rectangle){ 150,80, 40, 40 };
+    boxes[1] = (Rectangle){ 1200, 700, 40, 40 };
+    boxes[2] = (Rectangle){ 200, 600, 40, 40 };
+    boxes[3] = (Rectangle){ 1000, 50, 40, 40 };
+    boxes[4] = (Rectangle){ 500, 350, 40, 40 };
+
+    for (int i = 5; i < MAX_BOXES; i++)
+    {
+        boxes[i] = (Rectangle){(float)GetRandomValue(0,GetScreenWidth()), (float)GetRandomValue(0,GetScreenHeight()), (float)GetRandomValue(10,100), (float)GetRandomValue(10,100) };
+    }
+
+    *count = MAX_BOXES;
+}
+
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 1280;
+    const int screenHeight = 800;
+    InitWindow(screenWidth, screenHeight, "raylib [effects] example - top down lights");
+    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+
+    // initialize our 'world' of boxes
+    Rectangle boxes[MAX_BOXES];
+    int boxCount = 0;
+    SetupBoxes(boxes, &boxCount);
+
+    // create a checkerboard ground texture
+    Image img = GenImageChecked(64, 64, 32, 32, DARKBROWN, DARKGRAY);
+    Texture2D backgroundTexture = LoadTextureFromImage(img);
+    UnloadImage(img);
+
+    // create a global light mask to hold all the blended lights
+    RenderTexture lightMask = LoadRenderTexture(GetScreenWidth(), GetScreenHeight());
+
+    // setup initial light
+    SetUpLight(0, 600, 400, 300);
+    int nextLight = 1;
+
+    bool showLines = false;
+
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        // drag light 0
+        if (IsMouseButtonDown(MOUSE_BUTTON_LEFT))
+            MoveLight(0, GetMousePosition().x, GetMousePosition().y);
+
+        // make a new light
+        if (IsMouseButtonPressed(MOUSE_BUTTON_RIGHT) && nextLight < MAX_LIGHTS)
+        {
+            SetUpLight(nextLight, GetMousePosition().x, GetMousePosition().y, 200);
+            nextLight++;
+        }
+
+        // toggle debug info
+        if (IsKeyPressed(KEY_F1))
+            showLines = !showLines;
+
+        // update the lights and keep track if any were dirty so we know if we need to update the master light mask
+        bool dirtyLights = false;
+        for (int i = 0; i < MAX_LIGHTS; i++)
+        {
+            if (UpdateLight(i, boxes, boxCount))
+                dirtyLights = true;
+        }
+
+        // update the light mask
+        if (dirtyLights)
+        {
+            // build up the light mask
+            BeginTextureMode(lightMask);
+            ClearBackground(BLACK);
+
+            // force the blend mode to only set the alpha of the destination
+            rlSetBlendFactors(RLGL_SRC_ALPHA, RLGL_SRC_ALPHA, RLGL_MIN);
+            rlSetBlendMode(BLEND_CUSTOM);
+
+            // merge in all the light masks
+            for (int i = 0; i < MAX_LIGHTS; i++)
+            {
+                if (Lights[i].Active)
+                    DrawTextureRec(Lights[i].Mask.texture, (Rectangle){ 0, 0, (float)GetScreenWidth(), -(float)GetScreenHeight() }, Vector2Zero(), WHITE);
+            }
+
+            rlDrawRenderBatchActive();
+
+            // go back to normal
+            rlSetBlendMode(BLEND_ALPHA);
+            EndTextureMode();
+        }
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(BLACK);
+            
+            // draw the tile background
+            DrawTextureRec(backgroundTexture, (Rectangle){ 0,0,(float)GetScreenWidth(),(float)GetScreenHeight() }, Vector2Zero(), WHITE);
+            
+            // overlay the shadows from all the lights
+            DrawTextureRec(lightMask.texture, (Rectangle){ 0, 0, (float)GetScreenWidth(), -(float)GetScreenHeight() }, Vector2Zero(), ColorAlpha(WHITE, showLines ? 0.75f : 1.0f));
+
+            // draw the lights
+            for (int i = 0; i < MAX_LIGHTS; i++)
+            {
+                if (Lights[i].Active)
+                    DrawCircle((int)Lights[i].Position.x, (int)Lights[i].Position.y, 10, i == 0 ? YELLOW : WHITE);
+            }
+
+            if (showLines)
+            {
+                for (int s = 0; s < Lights[0].ShadowCount; s++)
+                {
+                    DrawTriangleFan(Lights[0].Shadows[s].Vertecies, 4, DARKPURPLE);
+                }
+
+                for (int b = 0; b < boxCount; b++)
+                {
+                    if (CheckCollisionRecs(boxes[b],Lights[0].Bounds))
+                        DrawRectangleRec(boxes[b], PURPLE);
+
+                    DrawRectangleLines((int)boxes[b].x, (int)boxes[b].y, (int)boxes[b].width, (int)boxes[b].height, DARKBLUE);
+                }
+
+                DrawText("(F1) Hide Shadow Volumes", 0, 60, 20, GREEN);
+            }
+            else
+            {
+                DrawText("(F1) Show Shadow Volumes", 0, 60, 20, GREEN);
+            }
+
+            DrawFPS(0, 0);
+            DrawText("Drag to move light #1", 0, 20, 20, DARKGREEN);
+            DrawText("Right click to add new light", 0, 40, 20, DARKGREEN);
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    UnloadTexture(backgroundTexture);
+    UnloadRenderTexture(lightMask);
+    for (int i = 0; i < MAX_LIGHTS; i++)
+    {
+        if (Lights[i].Active)
+            UnloadRenderTexture(Lights[i].Mask);
+    }
+
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}
\ No newline at end of file
diff --git a/examples/shapes/shapes_top_down_lights.png b/examples/shapes/shapes_top_down_lights.png
new file mode 100644
index 00000000..0eeac34a
--- /dev/null
+++ b/examples/shapes/shapes_top_down_lights.png
diff --git a/projects/VS2019/examples/shapes_top_down_lights.vcxproj b/projects/VS2019/examples/shapes_top_down_lights.vcxproj
new file mode 100644
index 00000000..65f4ea89
--- /dev/null
+++ b/projects/VS2019/examples/shapes_top_down_lights.vcxproj
@@ -0,0 +1,387 @@
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+      <Command>xcopy /y /d  "$(SolutionDir)\build\raylib\bin\$(Platform)\$(Configuration)\raylib.dll" "$(SolutionDir)\build\$(ProjectName)\bin\$(Platform)\$(Configuration)"</Command>
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+      <Command>xcopy /y /d  "$(SolutionDir)\build\raylib\bin\$(Platform)\$(Configuration)\raylib.dll" "$(SolutionDir)\build\$(ProjectName)\bin\$(Platform)\$(Configuration)"</Command>
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+    <PostBuildEvent>
+      <Message>Copy Release DLL to output directory</Message>
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+    <PostBuildEvent>
+      <Message>Copy Release DLL to output directory</Message>
+    </PostBuildEvent>
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+  <ItemGroup>
+    <ClCompile Include="..\..\..\examples\shapes\shapes_top_down_lights.c" />
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+    <ProjectReference Include="..\raylib\raylib.vcxproj">
+      <Project>{e89d61ac-55de-4482-afd4-df7242ebc859}</Project>
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+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
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+</Project>
\ No newline at end of file
diff --git a/projects/VS2019/raylib.sln b/projects/VS2019/raylib.sln
index aa92a456..82f5fff2 100644
--- a/projects/VS2019/raylib.sln
+++ b/projects/VS2019/raylib.sln
@@ -199,6 +199,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "shapes_easings_box_anim", "
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "shapes_easings_rectangle_array", "examples\shapes_easings_rectangle_array.vcxproj", "{1EDD4BCF-345C-4065-8CBD-7285224293C3}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "top_down_lights", "examples\shapes_top_down_lights.vcxproj", "{67A9CF3B-A5E8-442E-A437-ED74A08CA312}"
+EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "physics_demo", "examples\physics_demo.vcxproj", "{581F89BD-FBB9-4699-B8DB-EB38E6DEE097}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "physics_friction", "examples\physics_friction.vcxproj", "{A6260ED4-5361-4B61-B6B9-8D8119457BA4}"
@@ -1675,6 +1677,22 @@ Global
 		{1EDD4BCF-345C-4065-8CBD-7285224293C3}.Release|x64.Build.0 = Release|x64
 		{1EDD4BCF-345C-4065-8CBD-7285224293C3}.Release|x86.ActiveCfg = Release|Win32
 		{1EDD4BCF-345C-4065-8CBD-7285224293C3}.Release|x86.Build.0 = Release|Win32
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Debug.DLL|x64.ActiveCfg = Debug.DLL|x64
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Debug.DLL|x64.Build.0 = Debug.DLL|x64
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Debug.DLL|x86.ActiveCfg = Debug.DLL|Win32
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Debug.DLL|x86.Build.0 = Debug.DLL|Win32
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Debug|x64.ActiveCfg = Debug|x64
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Debug|x64.Build.0 = Debug|x64
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Debug|x86.ActiveCfg = Debug|Win32
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Debug|x86.Build.0 = Debug|Win32
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Release.DLL|x64.ActiveCfg = Release.DLL|x64
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Release.DLL|x64.Build.0 = Release.DLL|x64
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Release.DLL|x86.ActiveCfg = Release.DLL|Win32
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Release.DLL|x86.Build.0 = Release.DLL|Win32
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Release|x64.ActiveCfg = Release|x64
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Release|x64.Build.0 = Release|x64
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Release|x86.ActiveCfg = Release|Win32
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312}.Release|x86.Build.0 = Release|Win32
 		{581F89BD-FBB9-4699-B8DB-EB38E6DEE097}.Debug.DLL|x64.ActiveCfg = Debug.DLL|x64
 		{581F89BD-FBB9-4699-B8DB-EB38E6DEE097}.Debug.DLL|x64.Build.0 = Debug.DLL|x64
 		{581F89BD-FBB9-4699-B8DB-EB38E6DEE097}.Debug.DLL|x86.ActiveCfg = Debug.DLL|Win32
@@ -2238,6 +2256,7 @@ Global
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 		{1EDD4BCF-345C-4065-8CBD-7285224293C3} = {278D8859-20B1-428F-8448-064F46E1F021}
+		{67A9CF3B-A5E8-442E-A437-ED74A08CA312} = {278D8859-20B1-428F-8448-064F46E1F021}
 		{581F89BD-FBB9-4699-B8DB-EB38E6DEE097} = {D6B669E2-68D0-4E62-83D1-E14DDD6A356F}
 		{A6260ED4-5361-4B61-B6B9-8D8119457BA4} = {D6B669E2-68D0-4E62-83D1-E14DDD6A356F}
 		{29817904-E3D3-4C28-BD8D-A3A09DD199D2} = {D6B669E2-68D0-4E62-83D1-E14DDD6A356F}