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impl face culling

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This commit is contained in:
Bigfoot71 2025-03-12 21:42:29 +01:00
parent dcd60be477
commit 5f92a0fcd0
1 changed files with 40 additions and 10 deletions
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48
src/external/rlsw.h vendored
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@ -145,7 +145,7 @@ typedef enum {
SW_LINES = GL_LINES,
SW_TRIANGLES = GL_TRIANGLES,
SW_QUADS = GL_QUADS,
} SWfill;
} SWdraw;
typedef enum {
SW_FRONT = GL_FRONT,
@ -232,7 +232,9 @@ void swViewport(int x, int y, int width, int height);
void swClearColor(float r, float g, float b, float a);
void swClear(void);
void swBegin(SWfill mode);
void swCullFace(SWface face);
void swBegin(SWdraw mode);
void swEnd(void);
void swVertex2i(int x, int y);
@ -270,7 +272,7 @@ void swNormal3f(float x, float y, float z);
void swNormal3fv(const float* v);
void swBindArray(SWarray type, void *buffer);
void swDrawArrays(SWfill mode, int offset, int count);
void swDrawArrays(SWdraw mode, int offset, int count);
uint32_t swLoadTexture(const void *data, int width, int height, int format, int mipmapCount);
void swUnloadTexture(uint32_t id);
@ -370,7 +372,7 @@ typedef struct {
sw_vertex_t vertexBuffer[4]; // Buffer used for storing primitive vertices, used for processing and rendering
int vertexCounter; // Number of vertices in 'ctx.vertexBuffer'
SWfill fillMode; // Current polygon filling mode (e.g., lines, triangles)
SWdraw drawMode; // Current polygon filling mode (e.g., lines, triangles)
float pointSize; // Rasterized point size
float lineWidth; // Rasterized line width
@ -936,6 +938,18 @@ static inline void sw_triangle_project_and_clip(sw_vertex_t polygon[SW_MAX_CLIPP
sw_vec4_transform(v->homogeneous, v->position, RLSW.matMVP);
}
if (RLSW.stateFlags & SW_STATE_CULL_FACE) {
float x0 = polygon[0].homogeneous[0], y0 = polygon[0].homogeneous[1];
float x1 = polygon[1].homogeneous[0], y1 = polygon[1].homogeneous[1];
float x2 = polygon[2].homogeneous[0], y2 = polygon[2].homogeneous[1];
float sgnArea = (x1 - x0) * (y2 - y0) - (x2 - x0) * (y1 - y0);
if ((RLSW.cullFace == SW_BACK && sgnArea >= 0) || (RLSW.cullFace == SW_FRONT && sgnArea <= 0)) {
*vertexCounter = 0;
return;
}
}
if (sw_triangle_clip_w(polygon, vertexCounter) && sw_triangle_clip_xyz(polygon, vertexCounter)) {
for (int i = 0; i < *vertexCounter; i++) {
sw_vertex_t *v = polygon + i;
@ -1504,6 +1518,11 @@ static inline bool sw_is_texture_wrap_valid(int wrap)
return (wrap == SW_REPEAT || wrap == SW_CLAMP_TO_EDGE || SW_MIRRORED_REPEAT);
}
static inline bool sw_is_face_valid(int face)
{
return (face == SW_FRONT || face == SW_BACK);
}
/* === Public Implementation === */
@ -1546,6 +1565,8 @@ void swInit(int w, int h)
RLSW.vertexBuffer[0].normal[1] = 0.0f;
RLSW.vertexBuffer[0].normal[2] = 1.0f;
RLSW.cullFace = SW_BACK;
static const float defTex[3*2*2] =
{
1.0f, 1.0f, 1.0f,
@ -1889,14 +1910,23 @@ void swClear(void)
}
}
void swBegin(SWfill mode)
void swCullFace(SWface face)
{
if (!sw_is_face_valid(face)) {
RLSW.errCode = SW_INVALID_ENUM;
return;
}
RLSW.cullFace = face;
}
void swBegin(SWdraw mode)
{
if (mode < SW_POINTS || mode > SW_QUADS) {
RLSW.errCode = SW_INVALID_ENUM;
return;
}
RLSW.vertexCounter = 0;
RLSW.fillMode = mode;
RLSW.drawMode = mode;
}
void swEnd(void)
@ -1960,7 +1990,7 @@ void swVertex4fv(const float* v)
RLSW.vertexCounter++;
int neededVertices = 0;
switch (RLSW.fillMode) {
switch (RLSW.drawMode) {
case SW_POINTS:
neededVertices = 1;
break;
@ -1981,7 +2011,7 @@ void swVertex4fv(const float* v)
sw_matrix_mul(RLSW.matMVP, RLSW.matModel, RLSW.matView);
sw_matrix_mul(RLSW.matMVP, RLSW.matMVP, RLSW.matProjection);
switch (RLSW.fillMode) {
switch (RLSW.drawMode) {
case SW_POINTS:
break;
case SW_LINES:
@ -2259,7 +2289,7 @@ void swBindArray(SWarray type, void *buffer)
}
}
void swDrawArrays(SWfill mode, int offset, int count)
void swDrawArrays(SWdraw mode, int offset, int count)
{
if (RLSW.array.positions == 0) {
RLSW.errCode = SW_INVALID_OPERATION;