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[rmodels] Re-implement DrawBillboardPro

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coco24 2024-07-07 15:57:16 +08:00
parent 9a280cda0b
commit 91e19d4c42
1 changed files with 45 additions and 87 deletions
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132
src/rmodels.c
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@ -3659,108 +3659,66 @@ void DrawBillboardRec(Camera camera, Texture2D texture, Rectangle source, Vector
void DrawBillboardPro(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*fabsf((float)source.width/source.height), size.y };
size = (Vector2) { size.x*fabsf((float)source.width/source.height), 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 };
right = Vector3Scale(right, size.x);
up = Vector3Scale(up, size.y);
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)
if (size.x < 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));
source.x += size.x;
source.width *= -1.0;
right = Vector3Negate(right);
origin.x *= -1.0f;
}
if (size.y < 0.0f)
{
source.y += size.y;
source.height *= -1.0;
up = Vector3Negate(up);
origin.y *= -1.0f;
}
// Translate points to the draw center (position)
topLeft = Vector3Add(topLeft, position);
topRight = Vector3Add(topRight, position);
bottomRight = Vector3Add(bottomRight, position);
bottomLeft = Vector3Add(bottomLeft, position);
position = Vector3Add(position, Vector3Scale(Vector3Add(Vector3Scale(right, origin.x), Vector3Scale(up, origin.y)), 0.5f));
origin = Vector2Multiply(Vector2Scale(Vector2Add(origin, Vector2One()), 0.5f), (Vector2) { fabsf(size.x), fabsf(size.y) });
Vector3 forward;
if (rotation != 0.0) forward = Vector3CrossProduct(right, up);
Vector3 origin3D = Vector3Add(Vector3Scale(Vector3Normalize(right), origin.x), Vector3Scale(Vector3Normalize(up), origin.y));
Vector3 points[4];
points[0] = Vector3Zero();
points[1] = right;
points[2] = Vector3Add(up, right);
points[3] = up;
for (int i = 0; i < 4; i++)
{
points[i] = Vector3Subtract(points[i], origin3D);
if (rotation != 0.0) points[i] = Vector3RotateByAxisAngle(points[i], forward, rotation * DEG2RAD);
points[i] = Vector3Add(points[i], position);
}
Vector2 texcoords[4];
texcoords[0] = (Vector2) { (float)source.x/texture.width, (float)(source.y + source.height)/texture.height };
texcoords[1] = (Vector2) { (float)(source.x + source.width)/texture.width, (float)(source.y + source.height)/texture.height };
texcoords[2] = (Vector2) { (float)(source.x + source.width)/texture.width, (float)source.y/texture.height };
texcoords[3] = (Vector2) { (float)source.x/texture.width, (float)source.y/texture.height };
rlSetTexture(texture.id);
rlBegin(RL_QUADS);
rlColor4ub(tint.r, tint.g, tint.b, tint.a);
if (sizeRatio.x*sizeRatio.y >= 0.0f)
for (int i = 0; i < 4; i++)
{
// 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);
}
else
{
// Reverse vertex order if the size has only one negative dimension
rlTexCoord2f((float)(source.x + source.width)/texture.width, (float)source.y/texture.height);
rlVertex3f(topRight.x, topRight.y, topRight.z);
rlTexCoord2f((float)(source.x + source.width)/texture.width, (float)(source.y + source.height)/texture.height);
rlVertex3f(bottomRight.x, bottomRight.y, bottomRight.z);
rlTexCoord2f((float)source.x/texture.width, (float)(source.y + source.height)/texture.height);
rlVertex3f(bottomLeft.x, bottomLeft.y, bottomLeft.z);
rlTexCoord2f((float)source.x/texture.width, (float)source.y/texture.height);
rlVertex3f(topLeft.x, topLeft.y, topLeft.z);
rlTexCoord2f(texcoords[i].x, texcoords[i].y);
rlVertex3f(points[i].x, points[i].y, points[i].z);
}
rlEnd();
rlSetTexture(0);
}