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Sprite Flipping & Texture Offsets

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This commit is contained in:
Isuru Samarathunga
2025-11-02 16:05:43 +05:30
parent 7d69518bdc
commit e4cd9abe52
3 changed files with 16 additions and 5 deletions
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2
Samples/RPG/Src/imp/cpp/Game.cpp
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@ -55,7 +55,7 @@ namespace ia::iae::rpg
VOID OnUpdate(IN FLOAT32 deltaTime) VOID OnUpdate(IN FLOAT32 deltaTime)
{ {
IAEngine::DrawSprite(g_playerSpriteSheet, 0, 0, {100.0f, 100.0f}); IAEngine::DrawSprite(g_playerSpriteSheet, 2, 0, {100.0f, 100.0f}, {1.0f, 1.0f}, 0.0f);
} }
VOID OnResize(IN INT32 newWidth, IN INT32 newHeight) VOID OnResize(IN INT32 newWidth, IN INT32 newHeight)

2
Src/IAEngine/imp/cpp/IAEngine.cpp
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@ -288,6 +288,6 @@ namespace ia::iae
IN Vec2 scale, IN FLOAT32 rotation, IN BOOL flipH, IN BOOL flipV, IN Vec2 uvOffset) IN Vec2 scale, IN FLOAT32 rotation, IN BOOL flipH, IN BOOL flipV, IN Vec2 uvOffset)
{ {
const auto t = static_cast<Resource_SpriteSheet*>(g_resources[spriteSheet]); const auto t = static_cast<Resource_SpriteSheet*>(g_resources[spriteSheet]);
Renderer::DrawDynamicSpriteTopLeft(t->Texture, animationIndex, frameIndex, position, scale, rotation, flipH, flipV, uvOffset); Renderer::DrawDynamicSpriteTopLeft(t->Texture, frameIndex, animationIndex, position, scale, rotation, flipH, flipV, uvOffset);
} }
} // namespace ia::iae } // namespace ia::iae

17
Src/IAEngine/imp/cpp/Renderer.cpp
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@ -356,10 +356,21 @@ namespace ia::iae
{ {
const auto &d = g_texureData[texture]; const auto &d = g_texureData[texture];
const auto &t = g_activeTextureAtlasUVMap[texture]; const auto &t = g_activeTextureAtlasUVMap[texture];
const auto pX = (tileIndexX * ((FLOAT32) d.TileWidth)) * g_activeTextureAtlasInverseSize.x; const auto pX = ((tileIndexX + uvOffset.x) * ((FLOAT32) d.TileWidth)) * g_activeTextureAtlasInverseSize.x;
const auto pY = (tileIndexY * ((FLOAT32) d.TileHeight)) * g_activeTextureAtlasInverseSize.y; const auto pY = ((tileIndexY + uvOffset.y) * ((FLOAT32) d.TileHeight)) * g_activeTextureAtlasInverseSize.y;
return Vec4(t.x + pX, t.y + pY, d.TileWidth * g_activeTextureAtlasInverseSize.x, auto texCoords = Vec4(t.x + pX, t.y + pY, d.TileWidth * g_activeTextureAtlasInverseSize.x,
d.TileHeight * g_activeTextureAtlasInverseSize.y); d.TileHeight * g_activeTextureAtlasInverseSize.y);
if(flipH)
{
texCoords.x += texCoords.z;
texCoords.z *= -1;
}
if(flipV)
{
texCoords.y += texCoords.w;
texCoords.w *= -1;
}
return texCoords;
} }
} // namespace ia::iae } // namespace ia::iae