/**
* Round up the requested multisample count to the next supported sample size.
*/
unsigned
intel_quantize_num_samples(struct intel_screen *intel, unsigned num_samples)
{
const int *msaa_modes = intel_supported_msaa_modes(intel);
int quantized_samples = 0;
for (int i = 0; msaa_modes[i] != -1; ++i) {
if (msaa_modes[i] >= num_samples)
quantized_samples = msaa_modes[i];
else
break;
}
return quantized_samples;
}
static void
brw_initialize_context_constants(struct brw_context *brw)
{
struct gl_context *ctx = &brw->ctx;
unsigned max_samplers =
brw->gen >= 8 || brw->is_haswell ? BRW_MAX_TEX_UNIT : 16;
ctx->Const.QueryCounterBits.Timestamp = 36;
ctx->Const.StripTextureBorder = true;
ctx->Const.MaxDualSourceDrawBuffers = 1;
ctx->Const.MaxDrawBuffers = BRW_MAX_DRAW_BUFFERS;
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits = max_samplers;
ctx->Const.MaxTextureCoordUnits = 8; /* Mesa limit */
ctx->Const.MaxTextureUnits =
MIN2(ctx->Const.MaxTextureCoordUnits,
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits);
ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits = max_samplers;
if (brw->gen >= 7)
ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits = max_samplers;
else
ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits = 0;
if (getenv("INTEL_COMPUTE_SHADER")) {
ctx->Const.Program[MESA_SHADER_COMPUTE].MaxTextureImageUnits = BRW_MAX_TEX_UNIT;
ctx->Const.MaxUniformBufferBindings += 12;
} else {
ctx->Const.Program[MESA_SHADER_COMPUTE].MaxTextureImageUnits = 0;
}
ctx->Const.MaxCombinedTextureImageUnits =
ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits +
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits +
ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits +
ctx->Const.Program[MESA_SHADER_COMPUTE].MaxTextureImageUnits;
ctx->Const.MaxTextureLevels = 14; /* 8192 */
if (ctx->Const.MaxTextureLevels > MAX_TEXTURE_LEVELS)
ctx->Const.MaxTextureLevels = MAX_TEXTURE_LEVELS;
ctx->Const.Max3DTextureLevels = 12; /* 2048 */
ctx->Const.MaxCubeTextureLevels = 14; /* 8192 */
ctx->Const.MaxTextureMbytes = 1536;
if (brw->gen >= 7)
ctx->Const.MaxArrayTextureLayers = 2048;
else
ctx->Const.MaxArrayTextureLayers = 512;
ctx->Const.MaxTextureRectSize = 1 << 12;
ctx->Const.MaxTextureMaxAnisotropy = 16.0;
ctx->Const.MaxRenderbufferSize = 8192;
/* Hardware only supports a limited number of transform feedback buffers.
* So we need to override the Mesa default (which is based only on software
* limits).
*/
ctx->Const.MaxTransformFeedbackBuffers = BRW_MAX_SOL_BUFFERS;
/* On Gen6, in the worst case, we use up one binding table entry per
* transform feedback component (see comments above the definition of
* BRW_MAX_SOL_BINDINGS, in brw_context.h), so we need to advertise a value
* for MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS equal to
* BRW_MAX_SOL_BINDINGS.
*
* In "separate components" mode, we need to divide this value by
* BRW_MAX_SOL_BUFFERS, so that the total number of binding table entries
* used up by all buffers will not exceed BRW_MAX_SOL_BINDINGS.
*/
ctx->Const.MaxTransformFeedbackInterleavedComponents = BRW_MAX_SOL_BINDINGS;
ctx->Const.MaxTransformFeedbackSeparateComponents =
BRW_MAX_SOL_BINDINGS / BRW_MAX_SOL_BUFFERS;
ctx->Const.AlwaysUseGetTransformFeedbackVertexCount = true;
int max_samples;
const int *msaa_modes = intel_supported_msaa_modes(brw->intelScreen);
const int clamp_max_samples =
driQueryOptioni(&brw->optionCache, "clamp_max_samples");
if (clamp_max_samples < 0) {
max_samples = msaa_modes[0];
} else {
/* Select the largest supported MSAA mode that does not exceed
* clamp_max_samples.
*/
max_samples = 0;
for (int i = 0; msaa_modes[i] != 0; ++i) {
if (msaa_modes[i] <= clamp_max_samples) {
max_samples = msaa_modes[i];
break;
}
}
}
ctx->Const.MaxSamples = max_samples;
ctx->Const.MaxColorTextureSamples = max_samples;
ctx->Const.MaxDepthTextureSamples = max_samples;
ctx->Const.MaxIntegerSamples = max_samples;
if (brw->gen >= 7)
ctx->Const.MaxProgramTextureGatherComponents = 4;
else if (brw->gen == 6)
ctx->Const.MaxProgramTextureGatherComponents = 1;
ctx->Const.MinLineWidth = 1.0;
ctx->Const.MinLineWidthAA = 1.0;
ctx->Const.MaxLineWidth = 5.0;
ctx->Const.MaxLineWidthAA = 5.0;
ctx->Const.LineWidthGranularity = 0.5;
ctx->Const.MinPointSize = 1.0;
ctx->Const.MinPointSizeAA = 1.0;
ctx->Const.MaxPointSize = 255.0;
ctx->Const.MaxPointSizeAA = 255.0;
ctx->Const.PointSizeGranularity = 1.0;
if (brw->gen >= 5 || brw->is_g4x)
ctx->Const.MaxClipPlanes = 8;
ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeInstructions = 16 * 1024;
ctx->Const.Program[MESA_SHADER_VERTEX].MaxAluInstructions = 0;
ctx->Const.Program[MESA_SHADER_VERTEX].MaxTexInstructions = 0;
ctx->Const.Program[MESA_SHADER_VERTEX].MaxTexIndirections = 0;
ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeAluInstructions = 0;
ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeTexInstructions = 0;
ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeTexIndirections = 0;
ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeAttribs = 16;
ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeTemps = 256;
ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeAddressRegs = 1;
ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeParameters = 1024;
ctx->Const.Program[MESA_SHADER_VERTEX].MaxEnvParams =
MIN2(ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeParameters,
ctx->Const.Program[MESA_SHADER_VERTEX].MaxEnvParams);
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeInstructions = 1024;
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeAluInstructions = 1024;
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeTexInstructions = 1024;
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeTexIndirections = 1024;
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeAttribs = 12;
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeTemps = 256;
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeAddressRegs = 0;
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeParameters = 1024;
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxEnvParams =
MIN2(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeParameters,
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxEnvParams);
/* Fragment shaders use real, 32-bit twos-complement integers for all
* integer types.
*/
ctx->Const.Program[MESA_SHADER_FRAGMENT].LowInt.RangeMin = 31;
ctx->Const.Program[MESA_SHADER_FRAGMENT].LowInt.RangeMax = 30;
ctx->Const.Program[MESA_SHADER_FRAGMENT].LowInt.Precision = 0;
ctx->Const.Program[MESA_SHADER_FRAGMENT].HighInt = ctx->Const.Program[MESA_SHADER_FRAGMENT].LowInt;
ctx->Const.Program[MESA_SHADER_FRAGMENT].MediumInt = ctx->Const.Program[MESA_SHADER_FRAGMENT].LowInt;
if (brw->gen >= 7) {
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxAtomicCounters = MAX_ATOMIC_COUNTERS;
ctx->Const.Program[MESA_SHADER_VERTEX].MaxAtomicCounters = MAX_ATOMIC_COUNTERS;
ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxAtomicCounters = MAX_ATOMIC_COUNTERS;
ctx->Const.Program[MESA_SHADER_COMPUTE].MaxAtomicCounters = MAX_ATOMIC_COUNTERS;
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxAtomicBuffers = BRW_MAX_ABO;
ctx->Const.Program[MESA_SHADER_VERTEX].MaxAtomicBuffers = BRW_MAX_ABO;
ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxAtomicBuffers = BRW_MAX_ABO;
ctx->Const.Program[MESA_SHADER_COMPUTE].MaxAtomicBuffers = BRW_MAX_ABO;
ctx->Const.MaxCombinedAtomicBuffers = 3 * BRW_MAX_ABO;
}
/* Gen6 converts quads to polygon in beginning of 3D pipeline,
* but we're not sure how it's actually done for vertex order,
* that affect provoking vertex decision. Always use last vertex
* convention for quad primitive which works as expected for now.
*/
if (brw->gen >= 6)
ctx->Const.QuadsFollowProvokingVertexConvention = false;
ctx->Const.NativeIntegers = true;
ctx->Const.UniformBooleanTrue = 1;
/* From the gen4 PRM, volume 4 page 127:
*
* "For SURFTYPE_BUFFER non-rendertarget surfaces, this field specifies
* the base address of the first element of the surface, computed in
* software by adding the surface base address to the byte offset of
* the element in the buffer."
*
* However, unaligned accesses are slower, so enforce buffer alignment.
*/
ctx->Const.UniformBufferOffsetAlignment = 16;
ctx->Const.TextureBufferOffsetAlignment = 16;
if (brw->gen >= 6) {
ctx->Const.MaxVarying = 32;
ctx->Const.Program[MESA_SHADER_VERTEX].MaxOutputComponents = 128;
ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxInputComponents = 64;
ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxOutputComponents = 128;
ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxInputComponents = 128;
}
/* We want the GLSL compiler to emit code that uses condition codes */
for (int i = 0; i < MESA_SHADER_STAGES; i++) {
ctx->ShaderCompilerOptions[i].MaxIfDepth = brw->gen < 6 ? 16 : UINT_MAX;
ctx->ShaderCompilerOptions[i].EmitCondCodes = true;
ctx->ShaderCompilerOptions[i].EmitNoNoise = true;
ctx->ShaderCompilerOptions[i].EmitNoMainReturn = true;
ctx->ShaderCompilerOptions[i].EmitNoIndirectInput = true;
ctx->ShaderCompilerOptions[i].EmitNoIndirectOutput =
(i == MESA_SHADER_FRAGMENT);
ctx->ShaderCompilerOptions[i].EmitNoIndirectTemp =
(i == MESA_SHADER_FRAGMENT);
ctx->ShaderCompilerOptions[i].EmitNoIndirectUniform = false;
ctx->ShaderCompilerOptions[i].LowerClipDistance = true;
}
ctx->ShaderCompilerOptions[MESA_SHADER_VERTEX].OptimizeForAOS = true;
ctx->ShaderCompilerOptions[MESA_SHADER_GEOMETRY].OptimizeForAOS = true;
/* ARB_viewport_array */
if (brw->gen >= 7 && ctx->API == API_OPENGL_CORE) {
ctx->Const.MaxViewports = GEN7_NUM_VIEWPORTS;
ctx->Const.ViewportSubpixelBits = 0;
/* Cast to float before negating becuase MaxViewportWidth is unsigned.
*/
ctx->Const.ViewportBounds.Min = -(float)ctx->Const.MaxViewportWidth;
ctx->Const.ViewportBounds.Max = ctx->Const.MaxViewportWidth;
}
}