static void
brw_bind_rep_write_shader(struct brw_context *brw, float *color)
{
const char *vs_source =
"#extension GL_AMD_vertex_shader_layer : enable\n"
"#extension GL_ARB_draw_instanced : enable\n"
"attribute vec4 position;\n"
"uniform int layer;\n"
"void main()\n"
"{\n"
"#ifdef GL_AMD_vertex_shader_layer\n"
" gl_Layer = gl_InstanceID;\n"
"#endif\n"
" gl_Position = position;\n"
"}\n";
const char *fs_source =
"uniform vec4 color;\n"
"void main()\n"
"{\n"
" gl_FragColor = color;\n"
"}\n";
GLuint vs, fs;
struct brw_fast_clear_state *clear = brw->fast_clear_state;
struct gl_context *ctx = &brw->ctx;
if (clear->shader_prog) {
_mesa_UseProgram(clear->shader_prog);
_mesa_Uniform4fv(clear->color_location, 1, color);
return;
}
vs = _mesa_meta_compile_shader_with_debug(ctx, GL_VERTEX_SHADER, vs_source);
fs = _mesa_meta_compile_shader_with_debug(ctx, GL_FRAGMENT_SHADER, fs_source);
clear->shader_prog = _mesa_CreateProgram();
_mesa_AttachShader(clear->shader_prog, fs);
_mesa_DeleteShader(fs);
_mesa_AttachShader(clear->shader_prog, vs);
_mesa_DeleteShader(vs);
_mesa_BindAttribLocation(clear->shader_prog, 0, "position");
_mesa_ObjectLabel(GL_PROGRAM, clear->shader_prog, -1, "meta clear");
_mesa_LinkProgram(clear->shader_prog);
clear->color_location =
_mesa_GetUniformLocation(clear->shader_prog, "color");
_mesa_UseProgram(clear->shader_prog);
_mesa_Uniform4fv(clear->color_location, 1, color);
}
static GLuint
setup_program(struct brw_context *brw, bool msaa_tex)
{
struct gl_context *ctx = &brw->ctx;
struct blit_state *blit = &ctx->Meta->Blit;
char *fs_source;
const struct sampler_and_fetch *sampler = &samplers[msaa_tex];
_mesa_meta_setup_vertex_objects(&blit->VAO, &blit->VBO, true, 2, 2, 0);
GLuint *prog_id = &brw->meta_stencil_blit_programs[msaa_tex];
if (*prog_id) {
_mesa_UseProgram(*prog_id);
return *prog_id;
}
fs_source = ralloc_asprintf(NULL, fs_tmpl, sampler->sampler,
sampler->fetch);
_mesa_meta_compile_and_link_program(ctx, vs_source, fs_source,
"i965 stencil blit",
prog_id);
ralloc_free(fs_source);
return *prog_id;
}
static void
setup_glsl_msaa_blit_scaled_shader(struct gl_context *ctx,
struct blit_state *blit,
struct gl_renderbuffer *src_rb,
GLenum target, GLenum filter)
{
GLint loc_src_width, loc_src_height;
int i, samples;
int shader_offset = 0;
void *mem_ctx = ralloc_context(NULL);
char *fs_source;
char *name, *sample_number;
const uint8_t *sample_map;
char *sample_map_str = rzalloc_size(mem_ctx, 1);
char *sample_map_expr = rzalloc_size(mem_ctx, 1);
char *texel_fetch_macro = rzalloc_size(mem_ctx, 1);
const char *sampler_array_suffix = "";
float y_scale;
enum blit_msaa_shader shader_index;
assert(src_rb);
samples = MAX2(src_rb->NumSamples, 1);
y_scale = samples * 0.5;
/* We expect only power of 2 samples in source multisample buffer. */
assert(samples > 0 && _mesa_is_pow_two(samples));
while (samples >> (shader_offset + 1)) {
shader_offset++;
}
/* Update the assert if we plan to support more than 8X MSAA. */
assert(shader_offset > 0 && shader_offset < 4);
assert(target == GL_TEXTURE_2D_MULTISAMPLE ||
target == GL_TEXTURE_2D_MULTISAMPLE_ARRAY);
shader_index = BLIT_2X_MSAA_SHADER_2D_MULTISAMPLE_SCALED_RESOLVE +
shader_offset - 1;
if (target == GL_TEXTURE_2D_MULTISAMPLE_ARRAY) {
shader_index += BLIT_2X_MSAA_SHADER_2D_MULTISAMPLE_ARRAY_SCALED_RESOLVE -
BLIT_2X_MSAA_SHADER_2D_MULTISAMPLE_SCALED_RESOLVE;
sampler_array_suffix = "Array";
}
if (blit->msaa_shaders[shader_index]) {
_mesa_UseProgram(blit->msaa_shaders[shader_index]);
/* Update the uniform values. */
loc_src_width =
_mesa_GetUniformLocation(blit->msaa_shaders[shader_index], "src_width");
loc_src_height =
_mesa_GetUniformLocation(blit->msaa_shaders[shader_index], "src_height");
_mesa_Uniform1f(loc_src_width, src_rb->Width);
_mesa_Uniform1f(loc_src_height, src_rb->Height);
return;
}
name = ralloc_asprintf(mem_ctx, "vec4 MSAA scaled resolve");
/* Below switch is used to setup the shader expression, which computes
* sample index and map it to to a sample number on hardware.
*/
switch(samples) {
case 2:
sample_number = "sample_map[int(2 * fract(coord.x))]";
sample_map = ctx->Const.SampleMap2x;
break;
case 4:
sample_number = "sample_map[int(2 * fract(coord.x) + 4 * fract(coord.y))]";
sample_map = ctx->Const.SampleMap4x;
break;
case 8:
sample_number = "sample_map[int(2 * fract(coord.x) + 8 * fract(coord.y))]";
sample_map = ctx->Const.SampleMap8x;
break;
default:
sample_number = NULL;
sample_map = NULL;
_mesa_problem(ctx, "Unsupported sample count %d\n", samples);
unreachable("Unsupported sample count");
}
/* Create sample map string. */
for (i = 0 ; i < samples - 1; i++) {
ralloc_asprintf_append(&sample_map_str, "%d, ", sample_map[i]);
}
ralloc_asprintf_append(&sample_map_str, "%d", sample_map[samples - 1]);
/* Create sample map expression using above string. */
ralloc_asprintf_append(&sample_map_expr,
" const int sample_map[%d] = int[%d](%s);\n",
samples, samples, sample_map_str);
if (target == GL_TEXTURE_2D_MULTISAMPLE) {
ralloc_asprintf_append(&texel_fetch_macro,
"#define TEXEL_FETCH(coord) texelFetch(texSampler, ivec2(coord), %s);\n",
sample_number);
} else {
ralloc_asprintf_append(&texel_fetch_macro,
"#define TEXEL_FETCH(coord) texelFetch(texSampler, ivec3(coord, layer), %s);\n",
sample_number);
}
static const char vs_source[] =
"#version 130\n"
"in vec2 position;\n"
"in vec3 textureCoords;\n"
"out vec2 texCoords;\n"
"flat out int layer;\n"
"void main()\n"
"{\n"
" texCoords = textureCoords.xy;\n"
" layer = int(textureCoords.z);\n"
" gl_Position = vec4(position, 0.0, 1.0);\n"
"}\n"
;
fs_source = ralloc_asprintf(mem_ctx,
"#version 130\n"
"#extension GL_ARB_texture_multisample : enable\n"
"uniform sampler2DMS%s texSampler;\n"
"uniform float src_width, src_height;\n"
"in vec2 texCoords;\n"
"flat in int layer;\n"
"out vec4 out_color;\n"
"\n"
"void main()\n"
"{\n"
"%s"
" vec2 interp;\n"
" const vec2 scale = vec2(2.0f, %ff);\n"
" const vec2 scale_inv = vec2(0.5f, %ff);\n"
" const vec2 s_0_offset = vec2(0.25f, %ff);\n"
" vec2 s_0_coord, s_1_coord, s_2_coord, s_3_coord;\n"
" vec4 s_0_color, s_1_color, s_2_color, s_3_color;\n"
" vec4 x_0_color, x_1_color;\n"
" vec2 tex_coord = texCoords - s_0_offset;\n"
"\n"
" tex_coord *= scale;\n"
" clamp(tex_coord.x, 0.0f, scale.x * src_width - 1.0f);\n"
" clamp(tex_coord.y, 0.0f, scale.y * src_height - 1.0f);\n"
" interp = fract(tex_coord);\n"
" tex_coord = ivec2(tex_coord) * scale_inv;\n"
"\n"
" /* Compute the sample coordinates used for filtering. */\n"
" s_0_coord = tex_coord;\n"
" s_1_coord = tex_coord + vec2(scale_inv.x, 0.0f);\n"
" s_2_coord = tex_coord + vec2(0.0f, scale_inv.y);\n"
" s_3_coord = tex_coord + vec2(scale_inv.x, scale_inv.y);\n"
"\n"
" /* Fetch sample color values. */\n"
"%s"
" s_0_color = TEXEL_FETCH(s_0_coord)\n"
" s_1_color = TEXEL_FETCH(s_1_coord)\n"
" s_2_color = TEXEL_FETCH(s_2_coord)\n"
" s_3_color = TEXEL_FETCH(s_3_coord)\n"
"#undef TEXEL_FETCH\n"
"\n"
" /* Do bilinear filtering on sample colors. */\n"
" x_0_color = mix(s_0_color, s_1_color, interp.x);\n"
" x_1_color = mix(s_2_color, s_3_color, interp.x);\n"
" out_color = mix(x_0_color, x_1_color, interp.y);\n"
"}\n",
sampler_array_suffix,
sample_map_expr,
y_scale,
1.0f / y_scale,
1.0f / samples,
texel_fetch_macro);
_mesa_meta_compile_and_link_program(ctx, vs_source, fs_source, name,
&blit->msaa_shaders[shader_index]);
loc_src_width =
_mesa_GetUniformLocation(blit->msaa_shaders[shader_index], "src_width");
loc_src_height =
_mesa_GetUniformLocation(blit->msaa_shaders[shader_index], "src_height");
_mesa_Uniform1f(loc_src_width, src_rb->Width);
_mesa_Uniform1f(loc_src_height, src_rb->Height);
ralloc_free(mem_ctx);
}
static void
setup_glsl_msaa_blit_shader(struct gl_context *ctx,
struct blit_state *blit,
const struct gl_framebuffer *drawFb,
struct gl_renderbuffer *src_rb,
GLenum target)
{
const char *vs_source;
char *fs_source;
void *mem_ctx;
enum blit_msaa_shader shader_index;
bool dst_is_msaa = false;
GLenum src_datatype;
const char *vec4_prefix;
const char *sampler_array_suffix = "";
char *name;
const char *texcoord_type = "vec2";
int samples;
int shader_offset = 0;
if (src_rb) {
samples = MAX2(src_rb->NumSamples, 1);
src_datatype = _mesa_get_format_datatype(src_rb->Format);
} else {
/* depth-or-color glCopyTexImage fallback path that passes a NULL rb and
* doesn't handle integer.
*/
samples = 1;
src_datatype = GL_UNSIGNED_NORMALIZED;
}
/* We expect only power of 2 samples in source multisample buffer. */
assert(samples > 0 && _mesa_is_pow_two(samples));
while (samples >> (shader_offset + 1)) {
shader_offset++;
}
/* Update the assert if we plan to support more than 16X MSAA. */
assert(shader_offset >= 0 && shader_offset <= 4);
if (drawFb->Visual.samples > 1) {
/* If you're calling meta_BlitFramebuffer with the destination
* multisampled, this is the only path that will work -- swrast and
* CopyTexImage won't work on it either.
*/
assert(ctx->Extensions.ARB_sample_shading);
dst_is_msaa = true;
/* We need shader invocation per sample, not per pixel */
_mesa_set_enable(ctx, GL_MULTISAMPLE, GL_TRUE);
_mesa_set_enable(ctx, GL_SAMPLE_SHADING, GL_TRUE);
_mesa_MinSampleShading(1.0);
}
switch (target) {
case GL_TEXTURE_2D_MULTISAMPLE:
case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
if (src_rb && (src_rb->_BaseFormat == GL_DEPTH_COMPONENT ||
src_rb->_BaseFormat == GL_DEPTH_STENCIL)) {
if (dst_is_msaa)
shader_index = BLIT_MSAA_SHADER_2D_MULTISAMPLE_DEPTH_COPY;
else
shader_index = BLIT_MSAA_SHADER_2D_MULTISAMPLE_DEPTH_RESOLVE;
} else {
if (dst_is_msaa)
shader_index = BLIT_MSAA_SHADER_2D_MULTISAMPLE_COPY;
else {
shader_index = BLIT_1X_MSAA_SHADER_2D_MULTISAMPLE_RESOLVE +
shader_offset;
}
}
if (target == GL_TEXTURE_2D_MULTISAMPLE_ARRAY) {
shader_index += (BLIT_1X_MSAA_SHADER_2D_MULTISAMPLE_ARRAY_RESOLVE -
BLIT_1X_MSAA_SHADER_2D_MULTISAMPLE_RESOLVE);
sampler_array_suffix = "Array";
texcoord_type = "vec3";
}
break;
default:
_mesa_problem(ctx, "Unkown texture target %s\n",
_mesa_enum_to_string(target));
shader_index = BLIT_2X_MSAA_SHADER_2D_MULTISAMPLE_RESOLVE;
}
/* We rely on the enum being sorted this way. */
STATIC_ASSERT(BLIT_1X_MSAA_SHADER_2D_MULTISAMPLE_RESOLVE_INT ==
BLIT_1X_MSAA_SHADER_2D_MULTISAMPLE_RESOLVE + 5);
STATIC_ASSERT(BLIT_1X_MSAA_SHADER_2D_MULTISAMPLE_RESOLVE_UINT ==
BLIT_1X_MSAA_SHADER_2D_MULTISAMPLE_RESOLVE + 10);
if (src_datatype == GL_INT) {
shader_index += 5;
vec4_prefix = "i";
} else if (src_datatype == GL_UNSIGNED_INT) {
shader_index += 10;
vec4_prefix = "u";
} else {
vec4_prefix = "";
}
if (blit->msaa_shaders[shader_index]) {
_mesa_UseProgram(blit->msaa_shaders[shader_index]);
return;
}
mem_ctx = ralloc_context(NULL);
if (shader_index == BLIT_MSAA_SHADER_2D_MULTISAMPLE_DEPTH_RESOLVE ||
shader_index == BLIT_MSAA_SHADER_2D_MULTISAMPLE_ARRAY_DEPTH_RESOLVE ||
shader_index == BLIT_MSAA_SHADER_2D_MULTISAMPLE_ARRAY_DEPTH_COPY ||
shader_index == BLIT_MSAA_SHADER_2D_MULTISAMPLE_DEPTH_COPY) {
char *sample_index;
const char *arb_sample_shading_extension_string;
if (dst_is_msaa) {
arb_sample_shading_extension_string = "#extension GL_ARB_sample_shading : enable";
sample_index = "gl_SampleID";
name = "depth MSAA copy";
} else {
/* Don't need that extension, since we're drawing to a single-sampled
* destination.
*/
arb_sample_shading_extension_string = "";
/* From the GL 4.3 spec:
*
* "If there is a multisample buffer (the value of SAMPLE_BUFFERS
* is one), then values are obtained from the depth samples in
* this buffer. It is recommended that the depth value of the
* centermost sample be used, though implementations may choose
* any function of the depth sample values at each pixel.
*
* We're slacking and instead of choosing centermost, we've got 0.
*/
sample_index = "0";
name = "depth MSAA resolve";
}
vs_source = ralloc_asprintf(mem_ctx,
"#version 130\n"
"in vec2 position;\n"
"in %s textureCoords;\n"
"out %s texCoords;\n"
"void main()\n"
"{\n"
" texCoords = textureCoords;\n"
" gl_Position = vec4(position, 0.0, 1.0);\n"
"}\n",
texcoord_type,
texcoord_type);
fs_source = ralloc_asprintf(mem_ctx,
"#version 130\n"
"#extension GL_ARB_texture_multisample : enable\n"
"%s\n"
"uniform sampler2DMS%s texSampler;\n"
"in %s texCoords;\n"
"out vec4 out_color;\n"
"\n"
"void main()\n"
"{\n"
" gl_FragDepth = texelFetch(texSampler, i%s(texCoords), %s).r;\n"
"}\n",
arb_sample_shading_extension_string,
sampler_array_suffix,
texcoord_type,
texcoord_type,
sample_index);
} else {
/* You can create 2D_MULTISAMPLE textures with 0 sample count (meaning 1
* sample). Yes, this is ridiculous.
*/
char *sample_resolve;
const char *arb_sample_shading_extension_string;
const char *merge_function;
name = ralloc_asprintf(mem_ctx, "%svec4 MSAA %s",
vec4_prefix,
dst_is_msaa ? "copy" : "resolve");
if (dst_is_msaa) {
arb_sample_shading_extension_string = "#extension GL_ARB_sample_shading : enable";
sample_resolve = ralloc_asprintf(mem_ctx, " out_color = texelFetch(texSampler, i%s(texCoords), gl_SampleID);", texcoord_type);
merge_function = "";
} else {
int i;
int step;
if (src_datatype == GL_INT || src_datatype == GL_UNSIGNED_INT) {
merge_function =
"gvec4 merge(gvec4 a, gvec4 b) { return (a >> gvec4(1)) + (b >> gvec4(1)) + (a & b & gvec4(1)); }\n";
} else {
/* The divide will happen at the end for floats. */
merge_function =
"vec4 merge(vec4 a, vec4 b) { return (a + b); }\n";
}
arb_sample_shading_extension_string = "";
/* We're assuming power of two samples for this resolution procedure.
*
* To avoid losing any floating point precision if the samples all
* happen to have the same value, we merge pairs of values at a time
* (so the floating point exponent just gets increased), rather than
* doing a naive sum and dividing.
*/
assert(_mesa_is_pow_two(samples));
/* Fetch each individual sample. */
sample_resolve = rzalloc_size(mem_ctx, 1);
for (i = 0; i < samples; i++) {
ralloc_asprintf_append(&sample_resolve,
" gvec4 sample_1_%d = texelFetch(texSampler, i%s(texCoords), %d);\n",
i, texcoord_type, i);
}
/* Now, merge each pair of samples, then merge each pair of those,
* etc.
*/
for (step = 2; step <= samples; step *= 2) {
for (i = 0; i < samples; i += step) {
ralloc_asprintf_append(&sample_resolve,
" gvec4 sample_%d_%d = merge(sample_%d_%d, sample_%d_%d);\n",
step, i,
step / 2, i,
step / 2, i + step / 2);
}
}
/* Scale the final result. */
if (src_datatype == GL_UNSIGNED_INT || src_datatype == GL_INT) {
ralloc_asprintf_append(&sample_resolve,
" out_color = sample_%d_0;\n",
samples);
} else {
ralloc_asprintf_append(&sample_resolve,
" gl_FragColor = sample_%d_0 / %f;\n",
samples, (float)samples);
}
}
vs_source = ralloc_asprintf(mem_ctx,
"#version 130\n"
"in vec2 position;\n"
"in %s textureCoords;\n"
"out %s texCoords;\n"
"void main()\n"
"{\n"
" texCoords = textureCoords;\n"
" gl_Position = vec4(position, 0.0, 1.0);\n"
"}\n",
texcoord_type,
texcoord_type);
fs_source = ralloc_asprintf(mem_ctx,
"#version 130\n"
"#extension GL_ARB_texture_multisample : enable\n"
"%s\n"
"#define gvec4 %svec4\n"
"uniform %ssampler2DMS%s texSampler;\n"
"in %s texCoords;\n"
"out gvec4 out_color;\n"
"\n"
"%s" /* merge_function */
"void main()\n"
"{\n"
"%s\n" /* sample_resolve */
"}\n",
arb_sample_shading_extension_string,
vec4_prefix,
vec4_prefix,
sampler_array_suffix,
texcoord_type,
merge_function,
sample_resolve);
}
_mesa_meta_compile_and_link_program(ctx, vs_source, fs_source, name,
&blit->msaa_shaders[shader_index]);
ralloc_free(mem_ctx);
}