108 строки
3.1 KiB
C++
108 строки
3.1 KiB
C++
// Copyright 2018 The Emscripten Authors. All rights reserved.
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// Emscripten is available under two separate licenses, the MIT license and the
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// University of Illinois/NCSA Open Source License. Both these licenses can be
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// found in the LICENSE file.
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#define GL_GLEXT_PROTOTYPES
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#include <GLES/gl.h>
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#include <GLES/glext.h>
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#include <GLES3/gl3.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <emscripten.h>
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#include <emscripten/html5.h>
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#include <assert.h>
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#include <string>
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int result = 0;
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#define GL_CALL( x ) \
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{ \
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x; \
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GLenum error = glGetError(); \
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if( error != GL_NO_ERROR ) { \
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printf( "GL ERROR: %d, %s\n", (int)error, #x ); \
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result = 1; \
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} \
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} \
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int main()
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{
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EmscriptenWebGLContextAttributes attrs;
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emscripten_webgl_init_context_attributes(&attrs);
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attrs.enableExtensionsByDefault = 1;
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attrs.majorVersion = 2;
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attrs.minorVersion = 0;
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EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context = emscripten_webgl_create_context( "#canvas", &attrs );
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if (!context)
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{
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printf("Skipped: WebGL 2 is not supported.\n");
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#ifdef REPORT_RESULT
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REPORT_RESULT(result);
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#endif
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return 0;
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}
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emscripten_webgl_make_context_current(context);
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/* Two textures */
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GLuint tex[2];
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glGenTextures(2, tex);
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/* Verify that unpack buffer binding is not used after the buffer gets destroyed */
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glBindTexture(GL_TEXTURE_2D, tex[0]);
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{
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const int pixels[16] = {}; /* 4*1 all-black RGBA pixels */
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GLuint buffer;
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glGenBuffers(1, &buffer);
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glBindBuffer(GL_PIXEL_UNPACK_BUFFER, buffer);
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glBufferData(GL_PIXEL_UNPACK_BUFFER, 4*4, pixels, GL_STATIC_DRAW);
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/* This should use the unpack buffer */
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GL_CALL(glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 4, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr));
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glDeleteBuffers(1, &buffer);
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/* This not anymore */
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GL_CALL(glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 4, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixels));
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}
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/* Verify that unpack buffer is used for compressed image upload as well */
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const std::string exts = reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS));
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if(exts.find("WEBGL_compressed_texture_s3tc") != std::string::npos)
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{
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printf("WEBGL_compressed_texture_s3tc is supported, testing ...\n");
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glBindTexture(GL_TEXTURE_2D, tex[1]);
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const char pixels[8] = {}; /* 4*4 all-black S3TC DXT1 pixels */
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GLuint buffer;
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glGenBuffers(1, &buffer);
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glBindBuffer(GL_PIXEL_UNPACK_BUFFER, buffer);
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glBufferData(GL_PIXEL_UNPACK_BUFFER, 8, pixels, GL_STATIC_DRAW);
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/* This should all use the unpack buffer */
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GL_CALL(glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, 4, 4, 0, 8, nullptr));
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GL_CALL(glCompressedTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 4, 4, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, 8, nullptr));
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glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
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/* This not anymore */
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GL_CALL(glCompressedTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 4, 4, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, 8, pixels));
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glDeleteBuffers(1, &buffer);
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}
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else printf("WEBGL_compressed_texture_s3tc is NOT supported\n");
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glDeleteTextures(2, tex);
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#ifdef REPORT_RESULT
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REPORT_RESULT(result);
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#endif
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return 0;
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}
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