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fix perspective correct textures

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asrael 2025-11-10 10:51:50 -06:00
parent ac8ab8d60d
commit 2abc6c9486
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GPG key ID: 2786557804DFAE24
1 changed files with 21 additions and 17 deletions
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38
src/pxl8_gfx.c
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@ -1058,8 +1058,9 @@ static inline void pxl8_fill_scanline_textured_hicolor(
gfx->frame_pixel_count++; gfx->frame_pixel_count++;
f32 u = u0, v = v0; f32 u = u0, v = v0;
if (!gfx->affine_textures && fabsf(w0) > 1e-6f) { if (!gfx->affine_textures && fabsf(w0) > 1e-6f) {
u /= w0; f32 perspective_w = 1.0f / w0;
v /= w0; u *= perspective_w;
v *= perspective_w;
} }
u32 color = pxl8_sample_texture(gfx, texture_id, u, v); u32 color = pxl8_sample_texture(gfx, texture_id, u, v);
if (color & 0xFF000000) { if (color & 0xFF000000) {
@ -1089,8 +1090,9 @@ static inline void pxl8_fill_scanline_textured_hicolor(
gfx->frame_pixel_count++; gfx->frame_pixel_count++;
f32 tex_u = u, tex_v = v; f32 tex_u = u, tex_v = v;
if (!gfx->affine_textures && fabsf(w) > 1e-6f) { if (!gfx->affine_textures && fabsf(w) > 1e-6f) {
tex_u /= w; f32 perspective_w = 1.0f / w;
tex_v /= w; tex_u *= perspective_w;
tex_v *= perspective_w;
} }
u32 color = pxl8_sample_texture(gfx, texture_id, tex_u, tex_v); u32 color = pxl8_sample_texture(gfx, texture_id, tex_u, tex_v);
if (color & 0xFF000000) { if (color & 0xFF000000) {
@ -1131,8 +1133,9 @@ static inline void pxl8_fill_scanline_textured_indexed(
gfx->frame_pixel_count++; gfx->frame_pixel_count++;
f32 u = u0, v = v0; f32 u = u0, v = v0;
if (!gfx->affine_textures && fabsf(w0) > 1e-6f) { if (!gfx->affine_textures && fabsf(w0) > 1e-6f) {
u /= w0; f32 perspective_w = 1.0f / w0;
v /= w0; u *= perspective_w;
v *= perspective_w;
} }
u32 color = pxl8_sample_texture(gfx, texture_id, u, v); u32 color = pxl8_sample_texture(gfx, texture_id, u, v);
if (color != 0) { if (color != 0) {
@ -1162,8 +1165,9 @@ static inline void pxl8_fill_scanline_textured_indexed(
gfx->frame_pixel_count++; gfx->frame_pixel_count++;
f32 tex_u = u, tex_v = v; f32 tex_u = u, tex_v = v;
if (!gfx->affine_textures && fabsf(w) > 1e-6f) { if (!gfx->affine_textures && fabsf(w) > 1e-6f) {
tex_u /= w; f32 perspective_w = 1.0f / w;
tex_v /= w; tex_u *= perspective_w;
tex_v *= perspective_w;
} }
u32 color = pxl8_sample_texture(gfx, texture_id, tex_u, tex_v); u32 color = pxl8_sample_texture(gfx, texture_id, tex_u, tex_v);
if (color != 0) { if (color != 0) {
@ -1418,21 +1422,21 @@ void pxl8_3d_draw_triangle_textured(
f32 z_tmp; f32 z_tmp;
pxl8_project_to_screen(gfx, cv0, &tv[0].x, &tv[0].y, &z_tmp); pxl8_project_to_screen(gfx, cv0, &tv[0].x, &tv[0].y, &z_tmp);
tv[0].z = z_tmp; tv[0].z = z_tmp;
tv[0].u = gfx->affine_textures ? u0 : u0 * cv0.w; tv[0].u = gfx->affine_textures ? u0 : u0 / cv0.w;
tv[0].v = gfx->affine_textures ? v0f : v0f * cv0.w; tv[0].v = gfx->affine_textures ? v0f : v0f / cv0.w;
tv[0].w = cv0.w; tv[0].w = gfx->affine_textures ? 1.0f : 1.0f / cv0.w;
pxl8_project_to_screen(gfx, cv1, &tv[1].x, &tv[1].y, &z_tmp); pxl8_project_to_screen(gfx, cv1, &tv[1].x, &tv[1].y, &z_tmp);
tv[1].z = z_tmp; tv[1].z = z_tmp;
tv[1].u = gfx->affine_textures ? u1 : u1 * cv1.w; tv[1].u = gfx->affine_textures ? u1 : u1 / cv1.w;
tv[1].v = gfx->affine_textures ? v1f : v1f * cv1.w; tv[1].v = gfx->affine_textures ? v1f : v1f / cv1.w;
tv[1].w = cv1.w; tv[1].w = gfx->affine_textures ? 1.0f : 1.0f / cv1.w;
pxl8_project_to_screen(gfx, cv2, &tv[2].x, &tv[2].y, &z_tmp); pxl8_project_to_screen(gfx, cv2, &tv[2].x, &tv[2].y, &z_tmp);
tv[2].z = z_tmp; tv[2].z = z_tmp;
tv[2].u = gfx->affine_textures ? u2 : u2 * cv2.w; tv[2].u = gfx->affine_textures ? u2 : u2 / cv2.w;
tv[2].v = gfx->affine_textures ? v2f : v2f * cv2.w; tv[2].v = gfx->affine_textures ? v2f : v2f / cv2.w;
tv[2].w = cv2.w; tv[2].w = gfx->affine_textures ? 1.0f : 1.0f / cv2.w;
if (gfx->backface_culling) { if (gfx->backface_culling) {
i32 cross = i32 cross =