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GLSL: Legacy / extension fallbacks for textureSize and texelFetch

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rdb 2020-11-09 15:26:46 +01:00
parent 6fc2a0581a
commit 10fa5f62aa
1 changed files with 44 additions and 5 deletions
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49
spirv_glsl.cpp
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@ -5724,7 +5724,8 @@ string CompilerGLSL::legacy_tex_op(const std::string &op, const SPIRType &imgtyp
// GLES has very limited support for shadow samplers.
// Basically shadow2D and shadow2DProj work through EXT_shadow_samplers,
// everything else can just throw
if (image_is_comparison(imgtype, tex) && is_legacy_es())
bool is_comparison = image_is_comparison(imgtype, tex);
if (is_comparison && is_legacy_es())
{
if (op == "texture" || op == "textureProj")
require_extension_internal("GL_EXT_shadow_samplers");
@ -5732,8 +5733,20 @@ string CompilerGLSL::legacy_tex_op(const std::string &op, const SPIRType &imgtyp
SPIRV_CROSS_THROW(join(op, " not allowed on depth samplers in legacy ES"));
}
bool is_es_and_depth = is_legacy_es() && image_is_comparison(imgtype, tex);
std::string type_prefix = image_is_comparison(imgtype, tex) ? "shadow" : "texture";
if (op == "textureSize")
{
if (is_legacy_es())
SPIRV_CROSS_THROW("textureSize not supported in legacy ES");
if (is_comparison)
SPIRV_CROSS_THROW("textureSize not supported on shadow sampler in legacy GLSL");
require_extension_internal("GL_EXT_gpu_shader4");
}
if (op == "texelFetch" && is_legacy_es())
SPIRV_CROSS_THROW("texelFetch not supported in legacy ES");
bool is_es_and_depth = is_legacy_es() && is_comparison;
std::string type_prefix = is_comparison ? "shadow" : "texture";
if (op == "texture")
return is_es_and_depth ? join(type_prefix, type, "EXT") : join(type_prefix, type);
@ -5752,6 +5765,10 @@ string CompilerGLSL::legacy_tex_op(const std::string &op, const SPIRType &imgtyp
is_legacy_es() ? "ProjGradEXT" : is_legacy_desktop() ? "ProjGradARB" : "ProjGrad");
else if (op == "textureProjLodOffset")
return join(type_prefix, type, "ProjLodOffset");
else if (op == "textureSize")
return join("textureSize", type);
else if (op == "texelFetch")
return join("texelFetch", type);
else
{
SPIRV_CROSS_THROW(join("Unsupported legacy texture op: ", op));
@ -11161,8 +11178,19 @@ void CompilerGLSL::emit_instruction(const Instruction &instruction)
{
uint32_t result_type = ops[0];
uint32_t id = ops[1];
uint32_t img = ops[2];
auto expr = join("textureSize(", convert_separate_image_to_expression(ops[2]), ", ",
std::string fname = "textureSize";
if (is_legacy_desktop())
{
auto &type = expression_type(img);
auto &imgtype = get<SPIRType>(type.self);
fname = legacy_tex_op(fname, imgtype, img);
}
else if (is_legacy_es())
SPIRV_CROSS_THROW("textureSize is not supported in ESSL 100.");
auto expr = join(fname, "(", convert_separate_image_to_expression(img), ", ",
bitcast_expression(SPIRType::Int, ops[3]), ")");
auto &restype = get<SPIRType>(ops[0]);
expr = bitcast_expression(restype, SPIRType::Int, expr);
@ -11423,13 +11451,24 @@ void CompilerGLSL::emit_instruction(const Instruction &instruction)
string expr;
if (type.image.sampled == 2)
{
if (!options.es && options.version < 430)
require_extension_internal("GL_ARB_shader_image_size");
else if (options.es && options.version < 310)
SPIRV_CROSS_THROW("At least ESSL 3.10 required for imageSize.");
// The size of an image is always constant.
expr = join("imageSize(", to_expression(ops[2]), ")");
}
else
{
// This path is hit for samplerBuffers and multisampled images which do not have LOD.
expr = join("textureSize(", convert_separate_image_to_expression(ops[2]), ")");
std::string fname = "textureSize";
if (is_legacy())
{
auto &imgtype = get<SPIRType>(type.self);
fname = legacy_tex_op(fname, imgtype, ops[2]);
}
expr = join(fname, "(", convert_separate_image_to_expression(ops[2]), ")");
}
auto &restype = get<SPIRType>(ops[0]);