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Build user-space bounding box of shape in mg_push_vertex() _before_ transforming vertices

This commit is contained in:
Martin Fouilleul 2023-02-24 19:20:05 +01:00
parent 11c25bf001
commit bb106b717f
1 changed files with 16 additions and 16 deletions
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32
src/graphics.c
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@ -90,6 +90,7 @@ typedef struct mg_canvas_data
mp_rect clipStack[MG_CLIP_STACK_MAX_DEPTH];
u32 clipStackSize;
vec4 shapeExtents;
u32 nextShapeIndex;
u32 primitiveCount;
mg_primitive primitives[MG_MAX_PRIMITIVE_COUNT];
@ -585,6 +586,7 @@ void mg_path_push_element(mg_canvas_data* canvas, mg_path_elt elt)
void mg_reset_shape_index(mg_canvas_data* canvas)
{
canvas->nextShapeIndex = 0;
canvas->shapeExtents = (vec4){FLT_MAX, FLT_MAX, -FLT_MAX, -FLT_MAX};
}
u32 mg_next_shape_textured(mg_canvas_data* canvas, vec2 uv, mg_color color)
@ -593,24 +595,17 @@ u32 mg_next_shape_textured(mg_canvas_data* canvas, vec2 uv, mg_color color)
if(canvas->nextShapeIndex)
{
//NOTE: compute shape's bounding box for the _previous_ shape
vec2 boxMin = {FLT_MAX, FLT_MAX};
vec2 boxMax = {-FLT_MAX, -FLT_MAX};
for(int posIndex = canvas->shapeFirstVertexIndex;
posIndex < canvas->vertexCount;
posIndex++)
{
vec2 pos = *(vec2*)(layout->posBuffer + posIndex*layout->posStride);
boxMin.x = minimum(boxMin.x, pos.x);
boxMin.y = minimum(boxMin.y, pos.y);
boxMax.x = maximum(boxMax.x, pos.x);
boxMax.y = maximum(boxMax.y, pos.y);
}
//NOTE: set shape's bounding box for the _previous_ shape
int prevIndex = canvas->nextShapeIndex-1;
vec2 texSize = mg_image_size(canvas->currentImage);
mp_rect srcRegion = {0, 0, texSize.x, texSize.y};
mp_rect destRegion = {boxMin.x, boxMin.y, boxMax.x - boxMin.x, boxMax.y - boxMin.y};
mp_rect destRegion = {canvas->shapeExtents.x,
canvas->shapeExtents.y,
canvas->shapeExtents.z - canvas->shapeExtents.x,
canvas->shapeExtents.w - canvas->shapeExtents.y};
mg_mat2x3 srcRegionToTexture = {1/texSize.x, 0, srcRegion.x/texSize.x,
0, 1/texSize.y, srcRegion.y/texSize.y};
@ -670,7 +665,12 @@ int* mg_reserve_indices(mg_canvas_data* canvas, u32 indexCount)
void mg_push_vertex(mg_canvas_data* canvas, vec2 pos, vec4 cubic)
{
pos = mg_mat2x3_mul(canvas->transform, pos);
canvas->shapeExtents.x = minimum(canvas->shapeExtents.x, pos.x);
canvas->shapeExtents.y = minimum(canvas->shapeExtents.y, pos.y);
canvas->shapeExtents.z = maximum(canvas->shapeExtents.z, pos.x);
canvas->shapeExtents.w = maximum(canvas->shapeExtents.w, pos.y);
vec2 screenPos = mg_mat2x3_mul(canvas->transform, pos);
mg_vertex_layout* layout = &canvas->backend->vertexLayout;
DEBUG_ASSERT(canvas->vertexCount < layout->maxVertexCount);
@ -680,7 +680,7 @@ void mg_push_vertex(mg_canvas_data* canvas, vec2 pos, vec4 cubic)
u32 index = canvas->vertexCount;
*(vec2*)(((char*)layout->posBuffer) + index*layout->posStride) = pos;
*(vec2*)(((char*)layout->posBuffer) + index*layout->posStride) = screenPos;
*(vec4*)(((char*)layout->cubicBuffer) + index*layout->cubicStride) = cubic;
*(u32*)(((char*)layout->shapeIndexBuffer) + index*layout->shapeIndexStride) = shapeIndex;