OpenGL的 - 2D纹理映射 [英] OpenGL - 2D Texture Mapping

问题描述

我试图呈现一个简单的纹理（64×64），以64×64四。四是自身渲染，但是，没有质感。 （它呈现一个空白64×64四。）

I'm trying to render a simple texture(64x64) to a 64x64 quad. The quad itself is rendering, but, not the texture. (It's rendering a blank white 64x64 quad.)

我使用土壤加载图像。

static GLuint LoadPNG(char* filename)
{
    GLuint texture = SOIL_load_OGL_texture
    (
        filename,
        SOIL_LOAD_AUTO,
        SOIL_CREATE_NEW_ID,
        SOIL_FLAG_INVERT_Y | SOIL_FLAG_NTSC_SAFE_RGB | SOIL_FLAG_COMPRESS_TO_DXT
    );

    if (texture == 0)
        Log("Texture Load Error: " + string(filename));

    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    return texture;
}

这是我的渲染code，我可能没有正确映射，所以这可能是问题了。

This is my rendering code, I may not be mapping it correctly, so that could be the issue too.

// Draw Textured Quad
static void glDrawTexturedQuad(glRectF rect, GLuint tex)
{
    // Bind Texture
    glBindTexture (GL_TEXTURE_2D, tex);

    // Render Settings
    glEnable(GL_TEXTURE_2D);
    glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
    glColor3ub(255,255,255);

    glBegin(GL_QUADS);

    // Top Left
    glTexCoord2f(0, 1);
    glVertex2f(rect.X, rect.Y);

    // Top Right
    glTexCoord2f(1, 1);
    glVertex2f(rect.X + rect.Width, rect.Y); 

    // Bottom Right
    glTexCoord2f(1, 0);
    glVertex2f(rect.X + rect.Width, rect.Y + rect.Height); 

    // Bottom Left
    glTexCoord2f(0, 0);
    glVertex2f(rect.X, rect.Y + rect.Height);

    glEnd();
}

下面是相关code的其余部分。 （这其实只是临时code，粘合到一起进行测试，我会想出一个更好的解决方案后，我得到它的工作。）

Here is the rest of the relevant code. (This is really just temp code, to glue it all together for testing, I'll come up with a better solution after I get it working.)

static GLuint Texture;

static void LoadTextures()
{
    Texture = LoadPNG("filename");
}

static void glRenderTest()
{   
    glRectF rect = {20, 20, 64, 64};
    glDrawTexturedQuad(rect, Texture);
}

---

我也跟着发现所有的建议<一href=\"http://stackoverflow.com/questions/740151/what-are-the-usual-troubleshooting-steps-for-opengl-textures-not-showing\">here它仍然没有显示我的质感。

---

I've also followed all the suggestions found here It's still not displaying my texture.

我交换出去LodePNG土壤（简单的OpenGL图片库），这是一个有点更容易使用，但仍不能正常工作。

I swapped out LodePNG for SOIL(Simple OpenGL Image Library), it's a bit easier to use, but still isn't working.

我添加glTexEnv如下答案的建议，但我仍然刚开白盒子，我会尝试一些更多的设置，但我不认为这是它。 （编辑：尝试各种标志，什么都没有，还只是一个白色四）

I added glTexEnv as suggested in the answer below, but I'm still just getting a white box, I'll try some more settings, but I don't think that was it. ( Tried various flags, nothing, still just a white quad.)

推荐答案

有你打过电话

glEnable(GL_TEXTURE_2D);
glBindTexture (GL_TEXTURE_2D, texture);

在

glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

这篇关于OpenGL的 - 2D纹理映射的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！