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lima: implement GL_EXT_texture_swizzle

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This is a desktop OpenGL 2.1 extension that seems to be required by
glamor to support glyph rendering acceleration with R8 textures.
Implementation borrowed from vc4.

Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8969>
This commit is contained in:
Erico Nunes
2021-02-10 23:23:30 +01:00
committed by Marge Bot
parent 628ce5472c
commit 83eebadf92
3 changed files with 28 additions and 14 deletions
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36
src/gallium/drivers/lima/lima_program.c
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@@ -280,18 +280,26 @@ lima_fs_compile_shader(struct lima_context *ctx,
struct nir_lower_tex_options tex_options = {
.lower_txp = ~0u,
.swizzle_result = 0,
.swizzle_result = ~0u,
};
uint8_t identity[4] = { PIPE_SWIZZLE_X, PIPE_SWIZZLE_Y,
PIPE_SWIZZLE_Z, PIPE_SWIZZLE_W };
/* Lower the format swizzle and ARB_texture_swizzle-style swizzle. */
for (int i = 0; i < PIPE_MAX_SAMPLERS; i++) {
for (int j = 0; j < 4; j++)
tex_options.swizzles[i][j] = key->swizzles[i][j];
enum pipe_format format = key->tex[i].format;
if (!format)
continue;
if (memcmp(tex_options.swizzles[i], identity, 4) != 0)
tex_options.swizzle_result |= (1 << i);
const uint8_t *format_swizzle = lima_format_get_texel_swizzle(format);
for (int j = 0; j < 4; j++) {
uint8_t arb_swiz = key->tex[i].swizzle[j];
if (arb_swiz <= 3) {
tex_options.swizzles[i][j] = format_swizzle[arb_swiz];
} else {
tex_options.swizzles[i][j] = arb_swiz;
}
}
}
lima_program_optimize_fs_nir(nir, &tex_options);
@@ -514,10 +522,12 @@ lima_update_fs_state(struct lima_context *ctx)
lima_tex->num_samplers &&
lima_tex->num_textures)) {
for (int i = 0; i < lima_tex->num_samplers; i++) {
struct lima_sampler_view *texture = lima_sampler_view(lima_tex->textures[i]);
struct pipe_resource *prsc = texture->base.texture;
const uint8_t *swizzle = lima_format_get_texel_swizzle(prsc->format);
memcpy(key->swizzles[i], swizzle, 4);
struct pipe_sampler_view *sampler = lima_tex->textures[i];
key->tex[i].format = sampler->format;
key->tex[i].swizzle[0] = sampler->swizzle_r;
key->tex[i].swizzle[1] = sampler->swizzle_g;
key->tex[i].swizzle[2] = sampler->swizzle_b;
key->tex[i].swizzle[3] = sampler->swizzle_a;
}
}
@@ -525,7 +535,7 @@ lima_update_fs_state(struct lima_context *ctx)
uint8_t identity[4] = { PIPE_SWIZZLE_X, PIPE_SWIZZLE_Y,
PIPE_SWIZZLE_Z, PIPE_SWIZZLE_W };
for (int i = lima_tex->num_samplers; i < PIPE_MAX_SAMPLERS; i++)
memcpy(key->swizzles[i], identity, 4);
memcpy(key->tex[i].swizzle, identity, 4);
struct lima_fs_shader_state *old_fs = ctx->fs;