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gallium: create one vertex buffer and re-use

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This commit is contained in:
Brian 2008-03-20 14:27:14 -06:00
parent 18be9a588a
commit b028d32af4
1 changed files with 75 additions and 5 deletions
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80
src/gallium/auxiliary/util/u_blit.c
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@ -61,6 +61,9 @@ struct blit_state
/*struct pipe_viewport_state viewport;*/
struct pipe_sampler_state *vs;
struct pipe_sampler_state *fs;
struct pipe_buffer *vbuf; /**< quad vertices */
float vertices[4][2][4]; /**< vertex/texcoords for quad */
};
@ -72,6 +75,7 @@ struct blit_state *
util_create_blit(struct pipe_context *pipe, struct cso_context *cso)
{
struct blit_state *ctx;
uint i;
ctx = CALLOC_STRUCT(blit_state);
if (!ctx)
@ -132,6 +136,24 @@ util_create_blit(struct pipe_context *pipe, struct cso_context *cso)
/* fragment shader */
ctx->fs = util_make_fragment_tex_shader(pipe);
ctx->vbuf = pipe->winsys->buffer_create(pipe->winsys,
32,
PIPE_BUFFER_USAGE_VERTEX,
sizeof(ctx->vertices));
if (!ctx->vbuf) {
FREE(ctx);
ctx->pipe->delete_fs_state(ctx->pipe, ctx->fs);
ctx->pipe->delete_vs_state(ctx->pipe, ctx->vs);
return NULL;
}
/* init vertex data that doesn't change */
for (i = 0; i < 4; i++) {
ctx->vertices[i][0][3] = 1.0f; /* w */
ctx->vertices[i][1][2] = 0.0f; /* r */
ctx->vertices[i][1][3] = 1.0f; /* q */
}
return ctx;
}
@ -147,10 +169,55 @@ util_destroy_blit(struct blit_state *ctx)
pipe->delete_vs_state(pipe, ctx->vs);
pipe->delete_fs_state(pipe, ctx->fs);
pipe->winsys->buffer_destroy(pipe->winsys, ctx->vbuf);
FREE(ctx);
}
/**
* Setup vertex data for the textured quad we'll draw.
* Note: y=0=top
*/
static void
setup_vertex_data(struct blit_state *ctx,
float x0, float y0, float x1, float y1, float z)
{
void *buf;
ctx->vertices[0][0][0] = x0;
ctx->vertices[0][0][1] = y0;
ctx->vertices[0][0][2] = z;
ctx->vertices[0][1][0] = 0.0f; /*s*/
ctx->vertices[0][1][1] = 0.0f; /*t*/
ctx->vertices[1][0][0] = x1;
ctx->vertices[1][0][1] = y0;
ctx->vertices[1][0][2] = z;
ctx->vertices[1][1][0] = 1.0f; /*s*/
ctx->vertices[1][1][1] = 0.0f; /*t*/
ctx->vertices[2][0][0] = x1;
ctx->vertices[2][0][1] = y1;
ctx->vertices[2][0][2] = z;
ctx->vertices[2][1][0] = 1.0f;
ctx->vertices[2][1][1] = 1.0f;
ctx->vertices[3][0][0] = x0;
ctx->vertices[3][0][1] = y1;
ctx->vertices[3][0][2] = z;
ctx->vertices[3][1][0] = 0.0f;
ctx->vertices[3][1][1] = 1.0f;
buf = ctx->pipe->winsys->buffer_map(ctx->pipe->winsys, ctx->vbuf,
PIPE_BUFFER_USAGE_CPU_WRITE);
memcpy(buf, ctx->vertices, sizeof(ctx->vertices));
ctx->pipe->winsys->buffer_unmap(ctx->pipe->winsys, ctx->vbuf);
}
/**
* Copy pixel block from src surface to dst surface.
* Overlapping regions are acceptable.
@ -254,11 +321,14 @@ util_blit_pixels(struct blit_state *ctx,
cso_set_framebuffer(ctx->cso, &fb);
/* draw quad */
util_draw_texquad(pipe,
(float)dstX0,
(float)dstY0,
(float)dstX1,
(float)dstY1, z);
setup_vertex_data(ctx,
(float) dstX0, (float) dstY0,
(float) dstX1, (float) dstY1, z);
util_draw_vertex_buffer(ctx->pipe, ctx->vbuf,
PIPE_PRIM_TRIANGLE_FAN,
4, /* verts */
2); /* attribs/vert */
/* restore state we changed */
cso_restore_blend(ctx->cso);