Add ktx

ktx/tests/loadtests/glloadtests/shader-based/TextureMipmap.cpp

@@ -0,0 +1,125 @@
+/* -*- tab-width: 4; -*- */
+/* vi: set sw=2 ts=4 expandtab: */
+
+/*
+ * Copyright 2018-2020 Mark Callow.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @internal
+ * @file
+ * @~English
+ *
+ * @brief Definition of test sample for loading and displaying all the levels of a 2D mipmapped texture.
+ *
+ * @author Mark Callow, github.com/MarkCallow.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <algorithm>
+#include <time.h>
+#include <sstream>
+#include <vector>
+#include <ktx.h>
+
+#include "argparser.h"
+#include "TextureMipmap.h"
+#include "ltexceptions.h"
+
+#define member_size(type, member) sizeof(((type *)0)->member)
+
+const GLchar* pszLodFsDeclarations =
+    "precision mediump float;\n"
+
+    "in vec2 UV;\n"
+    "flat in float lambda;\n\n"
+
+    "layout (location = 0) out vec4 outFragColor;\n\n"
+
+    "uniform mediump sampler2D uSampler;\n\n";
+
+const GLchar* pszLodFsMain =
+   "void main()\n"
+    "{\n"
+    "    outFragColor = textureLod(uSampler, UV, lambda);\n"
+    "}";
+
+const GLchar* pszLodSrgbEncodeFsMain =
+    "void main()\n"
+    "{\n"
+    "    vec4 t_color = textureLod(uSampler, UV, lambda);\n"
+    "    outFragColor.rgb = srgb_encode(t_color.rgb);\n"
+    "    outFragColor.a = t_color.a;\n"
+    "}";
+
+const GLchar* pszLodVsMain =
+    "out vec2 UV;\n"
+    "flat out float lambda;\n\n"
+
+    "void main()\n"
+    "{\n"
+    "    UV = inUV;\n"
+    "    lambda = gl_InstanceID + 0.5;\n"
+    "    mat4 modelView = ubo.view * ubo.instance[gl_InstanceID].model;\n"
+    "    gl_Position = ubo.projection * modelView * inPos;\n"
+    "}";
+
+/* ------------------------------------------------------------------------- */
+
+LoadTestSample*
+TextureMipmap::create(uint32_t width, uint32_t height,
+                     const char* const szArgs, const std::string sBasePath)
+{
+    return new TextureMipmap(width, height, szArgs, sBasePath);
+}
+
+/**
+ * @internal
+ * @class TextureMipmap
+ * @~English
+ *
+ * @brief Test loading of 2D texture arrays.
+ */
+TextureMipmap::TextureMipmap(uint32_t width, uint32_t height,
+                           const char* const szArgs,
+                           const std::string sBasePath)
+        : InstancedSampleBase(width, height, szArgs, sBasePath)
+{
+    zoom = -15.0f;
+    if (texTarget != GL_TEXTURE_2D || textureInfo.numLevels == 1) {
+        std::stringstream message;
+        
+        message << "TextureMipmap requires a 2D mipmapped texture.";
+        throw std::runtime_error(message.str());
+    }
+
+    // Checking if KVData contains keys of interest would go here.
+
+    instanceCount = textureInfo.numLevels;
+
+    InstancedSampleBase::ShaderSource fs;
+    InstancedSampleBase::ShaderSource vs;
+
+    fs.push_back(pszLodFsDeclarations);
+    if (framebufferColorEncoding() == GL_LINEAR) {
+        fs.push_back(pszSrgbEncodeFunc);
+        fs.push_back(pszLodSrgbEncodeFsMain);
+    } else {
+        fs.push_back(pszLodFsMain);;
+    }
+    vs.push_back(pszInstancingVsDeclarations);
+    vs.push_back(pszLodVsMain);
+
+    try {
+        prepare(fs, vs);
+    } catch (std::exception& e) {
+        (void)e; // To quiet unused variable warnings from some compilers.
+        cleanup();
+        throw;
+    }
+    bInitialized = true;
+}