How to get texelFetch to read and return ints?
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The function texelFetch is working fine with floats, but not with ints.
texelFetch
This is the working example with floats. Host code:
floats
float Test[5][2] = { 2.0f, 2.0f };
GLuint tex;
GLuint tbo;
glGenBuffers(1, &tbo);
glBindBuffer(GL_TEXTURE_BUFFER, tbo);
glBufferData(GL_TEXTURE_BUFFER, sizeof(Test), Test, GL_STATIC_DRAW);
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_BUFFER, tex);
glTexBuffer(GL_TEXTURE_BUFFER, GL_RG32F, tbo);
float Test[5][2] = { 2.0f, 2.0f };
GLuint tex;
GLuint tbo;
glGenBuffers(1, &tbo);
glBindBuffer(GL_TEXTURE_BUFFER, tbo);
glBufferData(GL_TEXTURE_BUFFER, sizeof(Test), Test, GL_STATIC_DRAW);
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_BUFFER, tex);
glTexBuffer(GL_TEXTURE_BUFFER, GL_RG32F, tbo);
Fragment Shader code:
uniform samplerBuffer textureData;
void main()
{
vec2 TexBegin = texelFetch(textureData, 0).xy;
if (TexBegin.x == 2)
{
color = vec4(1.0, 0.0, 0.0, 1.0);
}
else
{
color = vec4(0.0, 0.0, 0.0, 1.0);
}
}
uniform samplerBuffer textureData;
void main()
{
vec2 TexBegin = texelFetch(textureData, 0).xy;
if (TexBegin.x == 2)
{
color = vec4(1.0, 0.0, 0.0, 1.0);
}
else
{
color = vec4(0.0, 0.0, 0.0, 1.0);
}
}
This is with int format, which only returns 0. Host code:
int
int Test[5][2] = { 2, 2 };
GLuint tex;
GLuint tbo;
glGenBuffers(1, &tbo);
glBindBuffer(GL_TEXTURE_BUFFER, tbo);
glBufferData(GL_TEXTURE_BUFFER, sizeof(Test), Test, GL_STATIC_DRAW);
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_BUFFER, tex);
glTexBuffer(GL_TEXTURE_BUFFER, GL_RG32I, tbo);
int Test[5][2] = { 2, 2 };
GLuint tex;
GLuint tbo;
glGenBuffers(1, &tbo);
glBindBuffer(GL_TEXTURE_BUFFER, tbo);
glBufferData(GL_TEXTURE_BUFFER, sizeof(Test), Test, GL_STATIC_DRAW);
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_BUFFER, tex);
glTexBuffer(GL_TEXTURE_BUFFER, GL_RG32I, tbo);
Fragment Shader code:
uniform samplerBuffer textureData;
void main()
{
vec2 TexBegin = texelFetch(textureData, 0).xy;
if (TexBegin.x == 2)
{
color = vec4(1.0, 0.0, 0.0, 1.0);
}
else
{
color = vec4(0.0, 0.0, 0.0, 1.0);
}
}
uniform samplerBuffer textureData;
void main()
{
vec2 TexBegin = texelFetch(textureData, 0).xy;
if (TexBegin.x == 2)
{
color = vec4(1.0, 0.0, 0.0, 1.0);
}
else
{
color = vec4(0.0, 0.0, 0.0, 1.0);
}
}
Changing vec2 to ivec2 errors with: "cannot convert float to int".
vec2
ivec2
Tags: c++,opengl,glslSource of the question:
https://stackoverflow.com/questions/7...
Question and source license information:
https://meta.stackexchange.com/help/l...
https://stackoverflow.com/