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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - swr software rasterizer fall back to OpenGL 2.1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110252">110252</a>
</td>
</tr>
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<th>Summary</th>
<td>swr software rasterizer fall back to OpenGL 2.1
</td>
</tr>
<tr>
<th>Product</th>
<td>Mesa
</td>
</tr>
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<th>Version</th>
<td>19.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Drivers/Gallium/swr
</td>
</tr>
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>wanghaipeng03@baidu.com
</td>
</tr>
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>glGetString(GL_EXTENSIONS) returns no GL_EXT_framebuffer_sRGB, which is
required by OpenGL 3.0 (src/mesa/main/version.c compute_version)。so
glGetString(GL_VERSION) fall back to OpenGL 2.1。
#include <stdio.h>
#include <stdlib.h>
#define GL_GLEXT_PROTOTYPES
#include <GL/osmesa.h>
//#include <GL/glext.h>
// settings
const unsigned int SCR_WIDTH = 960;
const unsigned int SCR_HEIGHT = 562;
int main(void) {
OSMesaContext ctx;
ctx = OSMesaCreateContextExt(OSMESA_RGBA, 16, 0, 0, NULL);
GLubyte *buffer = malloc(SCR_WIDTH * SCR_HEIGHT * 4 * sizeof(GLubyte));
OSMesaMakeCurrent(ctx, buffer, GL_UNSIGNED_BYTE, SCR_WIDTH, SCR_HEIGHT);
printf("GL_RENDERER = %s\n", (char*)glGetString(GL_RENDERER));
printf("GL_VERSION = %s\n", (char*)glGetString(GL_VERSION));
printf("GL_VENDOR = %s\n", (char*)glGetString(GL_VENDOR));
printf("GL_SHADING_LANGUAGE_VERSION = %s\n",
(char*)glGetString(GL_SHADING_LANGUAGE_VERSION));
printf("GL_EXTESIONS = %s\n", (char*)glGetString(GL_EXTENSIONS));
return 0;
}</pre>
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