DrawBillboardPro and rlglGetVersion.

1 files changed, 135 insertions, 1 deletions

diff --git a/src/models.c b/src/models.c
index 3f69001..26e7e72 100644
--- a/src/models.c
+++ b/src/models.c
@@ -182,6 +182,102 @@ void UnloadModelKeepMeshes( Model model ) {
     TRACELOG(LOG_INFO, "MODEL: Unloaded model (but not meshes) from RAM and VRAM");
 }
 
+void DrawBillboardProNoRatio( Camera camera, Texture2D texture, Rectangle source, Vector3 position, Vector3 up, Vector2 size, Vector2 origin, float rotation, Color tint ) {
+    // NOTE: Billboard size will maintain source rectangle aspect ratio, size will represent billboard width
+    // Vector2 sizeRatio = { size.x*(float)source.width/source.height, size.y };
+    Vector2 sizeRatio = { size.x, size.y };
+
+    Matrix matView = MatrixLookAt(camera.position, camera.target, camera.up);
+
+    Vector3 right = { matView.m0, matView.m4, matView.m8 };
+    //Vector3 up = { matView.m1, matView.m5, matView.m9 };
+
+    Vector3 rightScaled = Vector3Scale(right, sizeRatio.x/2);
+    Vector3 upScaled = Vector3Scale(up, sizeRatio.y/2);
+
+    Vector3 p1 = Vector3Add(rightScaled, upScaled);
+    Vector3 p2 = Vector3Subtract(rightScaled, upScaled);
+
+    Vector3 topLeft = Vector3Scale(p2, -1);
+    Vector3 topRight = p1;
+    Vector3 bottomRight = p2;
+    Vector3 bottomLeft = Vector3Scale(p1, -1);
+
+    if (rotation != 0.0f)
+    {
+        float sinRotation = sinf(rotation*DEG2RAD);
+        float cosRotation = cosf(rotation*DEG2RAD);
+
+        // NOTE: (-1, 1) is the range where origin.x, origin.y is inside the texture
+        float rotateAboutX = sizeRatio.x*origin.x/2;
+        float rotateAboutY = sizeRatio.y*origin.y/2;
+
+        float xtvalue, ytvalue;
+        float rotatedX, rotatedY;
+
+        xtvalue = Vector3DotProduct(right, topLeft) - rotateAboutX; // Project points to x and y coordinates on the billboard plane
+        ytvalue = Vector3DotProduct(up, topLeft) - rotateAboutY;
+        rotatedX = xtvalue*cosRotation - ytvalue*sinRotation + rotateAboutX; // Rotate about the point origin
+        rotatedY = xtvalue*sinRotation + ytvalue*cosRotation + rotateAboutY;
+        topLeft = Vector3Add(Vector3Scale(up, rotatedY), Vector3Scale(right, rotatedX)); // Translate back to cartesian coordinates
+
+        xtvalue = Vector3DotProduct(right, topRight) - rotateAboutX;
+        ytvalue = Vector3DotProduct(up, topRight) - rotateAboutY;
+        rotatedX = xtvalue*cosRotation - ytvalue*sinRotation + rotateAboutX;
+        rotatedY = xtvalue*sinRotation + ytvalue*cosRotation + rotateAboutY;
+        topRight = Vector3Add(Vector3Scale(up, rotatedY), Vector3Scale(right, rotatedX));
+
+        xtvalue = Vector3DotProduct(right, bottomRight) - rotateAboutX;
+        ytvalue = Vector3DotProduct(up, bottomRight) - rotateAboutY;
+        rotatedX = xtvalue*cosRotation - ytvalue*sinRotation + rotateAboutX;
+        rotatedY = xtvalue*sinRotation + ytvalue*cosRotation + rotateAboutY;
+        bottomRight = Vector3Add(Vector3Scale(up, rotatedY), Vector3Scale(right, rotatedX));
+
+        xtvalue = Vector3DotProduct(right, bottomLeft)-rotateAboutX;
+        ytvalue = Vector3DotProduct(up, bottomLeft)-rotateAboutY;
+        rotatedX = xtvalue*cosRotation - ytvalue*sinRotation + rotateAboutX;
+        rotatedY = xtvalue*sinRotation + ytvalue*cosRotation + rotateAboutY;
+        bottomLeft = Vector3Add(Vector3Scale(up, rotatedY), Vector3Scale(right, rotatedX));
+    }
+
+    // Translate points to the draw center (position)
+    topLeft = Vector3Add(topLeft, position);
+    topRight = Vector3Add(topRight, position);
+    bottomRight = Vector3Add(bottomRight, position);
+    bottomLeft = Vector3Add(bottomLeft, position);
+
+    rlSetTexture(texture.id);
+
+    rlBegin(RL_QUADS);
+        rlColor4ub(tint.r, tint.g, tint.b, tint.a);
+
+        // Bottom-left corner for texture and quad
+        rlTexCoord2f((float)source.x/texture.width, (float)source.y/texture.height);
+        rlVertex3f(topLeft.x, topLeft.y, topLeft.z);
+
+        // Top-left corner for texture and quad
+        rlTexCoord2f((float)source.x/texture.width, (float)(source.y + source.height)/texture.height);
+        rlVertex3f(bottomLeft.x, bottomLeft.y, bottomLeft.z);
+
+        // Top-right corner for texture and quad
+        rlTexCoord2f((float)(source.x + source.width)/texture.width, (float)(source.y + source.height)/texture.height);
+        rlVertex3f(bottomRight.x, bottomRight.y, bottomRight.z);
+
+        // Bottom-right corner for texture and quad
+        rlTexCoord2f((float)(source.x + source.width)/texture.width, (float)source.y/texture.height);
+        rlVertex3f(topRight.x, topRight.y, topRight.z);
+    rlEnd();
+
+    rlSetTexture(0);
+}
+
+void DrawBillboardRecNoRatio( Camera camera, Texture2D texture, Rectangle source, Vector3 position, Vector2 size, Color tint ) {
+    // NOTE: Billboard locked on axis-Y
+    Vector3 up = { 0.0f, 1.0f, 0.0f };
+
+    DrawBillboardProNoRatio(camera, texture, source, position, up, size, Vector2Zero(), 0.0f, tint);
+}
+
 /*
 ## Models - Basic
 */
@@ -2049,7 +2145,45 @@ int lmodelsDrawBillboardRec( lua_State *L ) {
 		lua_pushboolean( L, false );
 		return 1;
 	}
-	DrawBillboardRec( *state->camera3Ds[ cameraId ], *texturesGetSourceTexture( texId ), source, position, size, tint );
+	// DrawBillboardRec( *state->camera3Ds[ cameraId ], *texturesGetSourceTexture( texId ), source, position, size, tint );
+	DrawBillboardRecNoRatio( *state->camera3Ds[ cameraId ], *texturesGetSourceTexture( texId ), source, position, size, tint );
+	lua_pushboolean( L, true );
+
+	return 1;
+}
+
+/*
+> success = RL.DrawBillboardPro( Camera camera, Texture2D texture, Rectangle source, Vector3 position, Vector3 up, Vector2 size, Vector2 origin, float rotation, Color tint )
+
+Draw a billboard texture defined by source and rotation
+
+- Failure return false
+- Success return true
+*/
+int lmodelsDrawBillboardPro( lua_State *L ) {
+	if ( !lua_isnumber( L, 1 ) || !lua_isnumber( L, 2 ) || !lua_istable( L, 3 )
+	|| !lua_istable( L, 4 ) || !lua_istable( L, 5 ) || !lua_istable( L, 6 )
+	|| !lua_istable( L, 7 ) || !lua_isnumber( L, 8 ) || !lua_istable( L, 9 ) ) {
+		TraceLog( LOG_WARNING, "%s", "Bad call of function. RL.DrawBillboardPro( Camera camera, Texture2D texture, Rectangle source, Vector3 position, Vector3 up, Vector2 size, Vector2 origin, float rotation, Color tint )" );
+		lua_pushboolean( L, false );
+		return 1;
+	}
+	size_t cameraId = lua_tointeger( L, 1 );
+	size_t texId = lua_tointeger( L, 2 );
+	Rectangle source = uluaGetRectangleIndex( L, 3 );
+	Vector3 position = uluaGetVector3Index( L, 4 );
+	Vector3 up = uluaGetVector3Index( L, 5 );
+	Vector2 size = uluaGetVector2Index( L, 6 );
+	Vector2 origin = uluaGetVector2Index( L, 7 );
+	float rotation = lua_tonumber( L, 8 );
+	Color tint = uluaGetColorIndex( L, 9 );
+
+	if ( !validTexture( texId, TEXTURE_TYPE_ALL ) || !validCamera3D( cameraId ) ) {
+		lua_pushboolean( L, false );
+		return 1;
+	}
+	// DrawBillboardPro( *state->camera3Ds[ cameraId ], *texturesGetSourceTexture( texId ), source, position, up, size, origin, rotation, tint );
+	DrawBillboardProNoRatio( *state->camera3Ds[ cameraId ], *texturesGetSourceTexture( texId ), source, position, up, size, origin, rotation, tint );
 	lua_pushboolean( L, true );
 
 	return 1;