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demos: Introduce a helper function to create a projection matrix.

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This commit is contained in:
Henri Verbeet
2025-06-10 18:31:36 +02:00
parent eb988e95e1
commit c3c36d8517
Notes: Henri Verbeet 2025-06-16 17:48:41 +02:00 
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1567
2 changed files with 51 additions and 33 deletions
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38
demos/demo.h
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@@ -98,6 +98,11 @@ struct demo_vec4
float x, y, z, w;
};
struct demo_matrix
{
float m[4][4];
};
struct demo_swapchain_desc
{
unsigned int width;
@@ -123,6 +128,39 @@ static inline void demo_vec4_set(struct demo_vec4 *v, float x, float y, float z,
v->w = w;
}
static inline void demo_matrix_multiply(struct demo_matrix *out,
const struct demo_matrix *a, const struct demo_matrix *b)
{
unsigned int i, j;
for (i = 0; i < 4; ++i)
{
for (j = 0; j < 4; ++j)
{
out->m[i][j] = a->m[i][0] * b->m[0][j]
+ a->m[i][1] * b->m[1][j]
+ a->m[i][2] * b->m[2][j]
+ a->m[i][3] * b->m[3][j];
}
}
}
static inline void demo_matrix_perspective_rh(struct demo_matrix *m, float w, float h, float z_near, float z_far)
{
float sx = 2.0 * z_near / w;
float sy = 2.0 * z_near / h;
float sz = z_far / (z_near - z_far);
float d = z_near * sz;
*m = (struct demo_matrix)
{{
{ sx, 0.0f, 0.0f, 0.0f},
{0.0f, sy, 0.0f, 0.0f},
{0.0f, 0.0f, sz, -1.0f},
{0.0f, 0.0f, d, 0.0f},
}};
}
static inline void demo_rasterizer_desc_init_default(D3D12_RASTERIZER_DESC *desc)
{
desc->FillMode = D3D12_FILL_MODE_SOLID;