Implement textureSize as a visitor function in the SPIR-V generator

[libs/gl.git] / source / glsl / spirv.cpp

diff --git a/source/glsl/spirv.cpp b/source/glsl/spirv.cpp
index 33da0d5ca86c830bbb8f2248f4ee774b8ecc5e0d..186521c5efe109b1bfcb1f6d331cfb666f2617fa 100644 (file)
--- a/source/glsl/spirv.cpp
+++ b/source/glsl/spirv.cpp
@@ -107,7 +107,7 @@ const SpirVGenerator::BuiltinFunctionInfo SpirVGenerator::builtin_functions[] =
        { "findLSB", "u", "GLSL.std.450", GLSL450_FIND_I_LSB, { 1 }, 0, 0 },
        { "findMSB", "i", "GLSL.std.450", GLSL450_FIND_S_MSB, { 1 }, 0, 0 },
        { "findMSB", "u", "GLSL.std.450", GLSL450_FIND_U_MSB, { 1 }, 0, 0 },
-       { "textureSize", "", "", OP_IMAGE_QUERY_SIZE_LOD, { 1, 2 }, CAP_IMAGE_QUERY, 0 },
+       { "textureSize", "", "", 0, { }, CAP_IMAGE_QUERY, &SpirVGenerator::visit_builtin_texture_query },
        { "texture", "", "", 0, { }, 0, &SpirVGenerator::visit_builtin_texture },
        { "textureLod", "", "", 0, { }, 0, &SpirVGenerator::visit_builtin_texture },
        { "texelFetch", "", "", 0, { }, 0, &SpirVGenerator::visit_builtin_texel_fetch },
@@ -1284,6 +1284,36 @@ void SpirVGenerator::visit_builtin_matrix_comp_mult(FunctionCall &call, const ve
        r_expression_result_id = write_construct(get_id(*call.type), column_ids, n_columns);
 }
 
+void SpirVGenerator::visit_builtin_texture_query(FunctionCall &call, const vector<Id> &argument_ids)
+{
+       if(argument_ids.size()<1)
+               throw internal_error("invalid texture query call");
+
+       Opcode opcode;
+       if(call.name=="textureSize")
+               opcode = OP_IMAGE_QUERY_SIZE_LOD;
+       else
+               throw internal_error("invalid texture query call");
+
+       ImageTypeDeclaration &image_arg0 = dynamic_cast<ImageTypeDeclaration &>(*call.arguments[0]->type);
+
+       Id image_id;
+       if(image_arg0.sampled)
+       {
+               Id image_type_id = get_item(image_type_ids, get_id(image_arg0));
+               image_id = write_expression(OP_IMAGE, image_type_id, argument_ids[0]);
+       }
+       else
+               image_id = argument_ids[0];
+
+       Id result_type_id = get_id(*call.type);
+       r_expression_result_id = begin_expression(opcode, result_type_id, argument_ids.size());
+       writer.write(image_id);
+       for(unsigned i=1; i<argument_ids.size(); ++i)
+               writer.write(argument_ids[i]);
+       end_expression(opcode);
+}
+
 void SpirVGenerator::visit_builtin_texture(FunctionCall &call, const vector<Id> &argument_ids)
 {
        if(argument_ids.size()<2)
@@ -1468,6 +1498,7 @@ void SpirVGenerator::visit(ImageTypeDeclaration &image)
        {
                writer.write_op_name(type_id, image.name);
                writer.write_op(content.globals, OP_TYPE_SAMPLED_IMAGE, type_id, image_id);
+               insert_unique(image_type_ids, type_id, image_id);
        }
 
        if(image.dimensions==ImageTypeDeclaration::ONE)