lima: implement GL_EXT_texture_swizzle
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>
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@ -57,7 +57,10 @@ struct lima_fs_bind_state {
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struct lima_fs_key {
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struct lima_fs_bind_state *shader_state;
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uint8_t swizzles[PIPE_MAX_SAMPLERS][4];
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struct {
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enum pipe_format format;
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uint8_t swizzle[4];
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} tex[PIPE_MAX_SAMPLERS];
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};
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#define LIMA_MAX_VARYING_NUM 13
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@ -280,18 +280,26 @@ lima_fs_compile_shader(struct lima_context *ctx,
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struct nir_lower_tex_options tex_options = {
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.lower_txp = ~0u,
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.swizzle_result = 0,
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.swizzle_result = ~0u,
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};
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uint8_t identity[4] = { PIPE_SWIZZLE_X, PIPE_SWIZZLE_Y,
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PIPE_SWIZZLE_Z, PIPE_SWIZZLE_W };
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/* Lower the format swizzle and ARB_texture_swizzle-style swizzle. */
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for (int i = 0; i < PIPE_MAX_SAMPLERS; i++) {
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for (int j = 0; j < 4; j++)
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tex_options.swizzles[i][j] = key->swizzles[i][j];
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enum pipe_format format = key->tex[i].format;
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if (!format)
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continue;
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if (memcmp(tex_options.swizzles[i], identity, 4) != 0)
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tex_options.swizzle_result |= (1 << i);
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const uint8_t *format_swizzle = lima_format_get_texel_swizzle(format);
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for (int j = 0; j < 4; j++) {
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uint8_t arb_swiz = key->tex[i].swizzle[j];
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if (arb_swiz <= 3) {
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tex_options.swizzles[i][j] = format_swizzle[arb_swiz];
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} else {
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tex_options.swizzles[i][j] = arb_swiz;
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}
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}
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}
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lima_program_optimize_fs_nir(nir, &tex_options);
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@ -514,10 +522,12 @@ lima_update_fs_state(struct lima_context *ctx)
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lima_tex->num_samplers &&
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lima_tex->num_textures)) {
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for (int i = 0; i < lima_tex->num_samplers; i++) {
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struct lima_sampler_view *texture = lima_sampler_view(lima_tex->textures[i]);
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struct pipe_resource *prsc = texture->base.texture;
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const uint8_t *swizzle = lima_format_get_texel_swizzle(prsc->format);
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memcpy(key->swizzles[i], swizzle, 4);
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struct pipe_sampler_view *sampler = lima_tex->textures[i];
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key->tex[i].format = sampler->format;
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key->tex[i].swizzle[0] = sampler->swizzle_r;
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key->tex[i].swizzle[1] = sampler->swizzle_g;
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key->tex[i].swizzle[2] = sampler->swizzle_b;
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key->tex[i].swizzle[3] = sampler->swizzle_a;
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}
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}
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@ -525,7 +535,7 @@ lima_update_fs_state(struct lima_context *ctx)
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uint8_t identity[4] = { PIPE_SWIZZLE_X, PIPE_SWIZZLE_Y,
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PIPE_SWIZZLE_Z, PIPE_SWIZZLE_W };
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for (int i = lima_tex->num_samplers; i < PIPE_MAX_SAMPLERS; i++)
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memcpy(key->swizzles[i], identity, 4);
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memcpy(key->tex[i].swizzle, identity, 4);
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struct lima_fs_shader_state *old_fs = ctx->fs;
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@ -101,6 +101,7 @@ lima_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
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case PIPE_CAP_UMA:
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case PIPE_CAP_NATIVE_FENCE_FD:
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case PIPE_CAP_FRAGMENT_SHADER_TEXTURE_LOD:
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case PIPE_CAP_TEXTURE_SWIZZLE:
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return 1;
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/* Unimplemented, but for exporting OpenGL 2.0 */
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