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[examples] shaders shadowmap rendering camera fix #6041

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[examples] shaders shadowmap rendering camera fix #6041

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421fd7e
Update the camera before sending it to the shader
JeffM2501 Aug 6, 2026
eaf19a9
tabs to spaces (oops)
JeffM2501 Aug 8, 2026
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58 changes: 30 additions & 28 deletions examples/shaders/shaders_shadowmap_rendering.c
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Original file line number Diff line number Diff line change
Expand Up @@ -21,9 +21,9 @@
#include "rlgl.h"

#if defined(PLATFORM_DESKTOP)
#define GLSL_VERSION 330
#define GLSL_VERSION 330
#else // PLATFORM_ANDROID, PLATFORM_WEB
#define GLSL_VERSION 100
#define GLSL_VERSION 100
#endif

#define SHADOWMAP_RESOLUTION 1024
Expand Down Expand Up @@ -57,18 +57,18 @@ int main(void)
camera.fovy = 45.0f;

Shader shadowShader = LoadShader(TextFormat("resources/shaders/glsl%i/shadowmap.vs", GLSL_VERSION),
TextFormat("resources/shaders/glsl%i/shadowmap.fs", GLSL_VERSION));
TextFormat("resources/shaders/glsl%i/shadowmap.fs", GLSL_VERSION));
shadowShader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(shadowShader, "viewPos");

Vector3 lightDir = Vector3Normalize((Vector3){ 0.35f, -1.0f, -0.35f });
Vector3 lightDir = Vector3Normalize((Vector3) { 0.35f, -1.0f, -0.35f });
Color lightColor = WHITE;
Vector4 lightColorNormalized = ColorNormalize(lightColor);
int lightDirLoc = GetShaderLocation(shadowShader, "lightDir");
int lightColLoc = GetShaderLocation(shadowShader, "lightColor");
SetShaderValue(shadowShader, lightDirLoc, &lightDir, SHADER_UNIFORM_VEC3);
SetShaderValue(shadowShader, lightColLoc, &lightColorNormalized, SHADER_UNIFORM_VEC4);
int ambientLoc = GetShaderLocation(shadowShader, "ambient");
float ambient[4] = {0.1f, 0.1f, 0.1f, 1.0f};
float ambient[4] = { 0.1f, 0.1f, 0.1f, 1.0f };
SetShaderValue(shadowShader, ambientLoc, ambient, SHADER_UNIFORM_VEC4);
int lightVPLoc = GetShaderLocation(shadowShader, "lightVP");
int shadowMapLoc = GetShaderLocation(shadowShader, "shadowMap");
Expand All @@ -81,7 +81,7 @@ int main(void)
for (int i = 0; i < robot.materialCount; i++) robot.materials[i].shader = shadowShader;

int animCount = 0;
ModelAnimation *anims = LoadModelAnimations("resources/models/robot.glb", &animCount);
ModelAnimation* anims = LoadModelAnimations("resources/models/robot.glb", &animCount);

RenderTexture2D shadowMap = LoadShadowmapRenderTexture(SHADOWMAP_RESOLUTION, SHADOWMAP_RESOLUTION);

Expand Down Expand Up @@ -111,9 +111,11 @@ int main(void)
//----------------------------------------------------------------------------------
float deltaTime = GetFrameTime();

UpdateCamera(&camera, CAMERA_ORBITAL);

// send the updated camera position to the shader so that it can calculate the correct lighting for the scene
Vector3 cameraPos = camera.position;
SetShaderValue(shadowShader, shadowShader.locs[SHADER_LOC_VECTOR_VIEW], &cameraPos, SHADER_UNIFORM_VEC3);
UpdateCamera(&camera, CAMERA_ORBITAL);

frameCounter++;
frameCounter %= (anims[0].keyframeCount);
Expand All @@ -123,19 +125,19 @@ int main(void)
const float cameraSpeed = 0.05f;
if (IsKeyDown(KEY_LEFT))
{
if (lightDir.x < 0.6f) lightDir.x += cameraSpeed*60.0f*deltaTime;
if (lightDir.x < 0.6f) lightDir.x += cameraSpeed * 60.0f * deltaTime;
}
if (IsKeyDown(KEY_RIGHT))
{
if (lightDir.x > -0.6f) lightDir.x -= cameraSpeed*60.0f*deltaTime;
if (lightDir.x > -0.6f) lightDir.x -= cameraSpeed * 60.0f * deltaTime;
}
if (IsKeyDown(KEY_UP))
{
if (lightDir.z < 0.6f) lightDir.z += cameraSpeed*60.0f*deltaTime;
if (lightDir.z < 0.6f) lightDir.z += cameraSpeed * 60.0f * deltaTime;
}
if (IsKeyDown(KEY_DOWN))
{
if (lightDir.z > -0.6f) lightDir.z -= cameraSpeed*60.0f*deltaTime;
if (lightDir.z > -0.6f) lightDir.z -= cameraSpeed * 60.0f * deltaTime;
}

lightDir = Vector3Normalize(lightDir);
Expand All @@ -151,34 +153,34 @@ int main(void)
// We can later use the depth buffer when rendering everything from the player's point of view
// to determine whether a given point is "visible" to the light
BeginTextureMode(shadowMap);
ClearBackground(WHITE);
ClearBackground(WHITE);

BeginMode3D(lightCamera);
lightView = rlGetMatrixModelview();
lightProj = rlGetMatrixProjection();
DrawScene(cube, robot);
EndMode3D();
BeginMode3D(lightCamera);
lightView = rlGetMatrixModelview();
lightProj = rlGetMatrixProjection();
DrawScene(cube, robot);
EndMode3D();

EndTextureMode();
lightViewProj = MatrixMultiply(lightView, lightProj);

// PASS 02: Draw the scene into main framebuffer, using the generated shadowmap
BeginDrawing();
ClearBackground(RAYWHITE);
ClearBackground(RAYWHITE);

SetShaderValueMatrix(shadowShader, lightVPLoc, lightViewProj);
rlEnableShader(shadowShader.id);
SetShaderValueMatrix(shadowShader, lightVPLoc, lightViewProj);
rlEnableShader(shadowShader.id);

rlActiveTextureSlot(textureActiveSlot);
rlEnableTexture(shadowMap.depth.id);
rlSetUniform(shadowMapLoc, &textureActiveSlot, SHADER_UNIFORM_INT, 1);
rlActiveTextureSlot(textureActiveSlot);
rlEnableTexture(shadowMap.depth.id);
rlSetUniform(shadowMapLoc, &textureActiveSlot, SHADER_UNIFORM_INT, 1);

BeginMode3D(camera);
DrawScene(cube, robot); // Draw the same exact things as we drew in the shadowmap!
EndMode3D();
BeginMode3D(camera);
DrawScene(cube, robot); // Draw the same exact things as we drew in the shadowmap!
EndMode3D();

DrawText("Use the arrow keys to rotate the light!", 10, 10, 30, RED);
DrawText("Shadows in raylib using the shadowmapping algorithm!", screenWidth - 280, screenHeight - 20, 10, GRAY);
DrawText("Use the arrow keys to rotate the light!", 10, 10, 30, RED);
DrawText("Shadows in raylib using the shadowmapping algorithm!", screenWidth - 280, screenHeight - 20, 10, GRAY);

EndDrawing();

Expand Down
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