All posts by kpark
OpenGL TimeVaryingAlphaTexture
OpenGL AlphaTextureSquare
lecture17
OpenGL Blending
OpenGL Multi-Texturing
http://dis.dankook.ac.kr/lectures/cg12/entry/OpenGL-Multi-Texturing
ADD
MODULATE
Single Pass Multi-Texturing (Activating Multiple Texture Coordinates using GLSL)4738572556.zip
Multi-Pass Multi-Texturing (Using Blending)5764603540.zip
Texture Animation
Texture Animation
5974008442.zip
// init 중간생략..
for (int i=0; i<7; i++)
{
char filename[255];
sprintf(filename, “tacgun0%d.rgb”, i);
texture[i] = InitTexture(filename);
}
// draw 중간생략..
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texture[currentTex]);
drawSquare();
glBindTexture(GL_TEXTURE_2D, 0);
glBindTexture(GL_TEXTURE_2D, texture[currentTex]);
drawSquare();
glBindTexture(GL_TEXTURE_2D, 0);
// update
void update()
{
static int currentTime, deltaTime, prevTime = 0;
currentTime = glutGet(GLUT_ELAPSED_TIME);
deltaTime = currentTime – prevTime;
prevTime = currentTime;
currentTex = (GLuint) ((float)currentTime * 0.01) % 7;
glutPostRedisplay();
}
{
static int currentTime, deltaTime, prevTime = 0;
currentTime = glutGet(GLUT_ELAPSED_TIME);
deltaTime = currentTime – prevTime;
prevTime = currentTime;
currentTex = (GLuint) ((float)currentTime * 0.01) % 7;
glutPostRedisplay();
}
ModernOpenGL Mipmap
Automatic mipmap generation
Mipmaps of a texture can be automatically generated with the glGenerateMipmap function. OpenGL 3.0 or greater is required for this function (or the extension GL_ARB_framebuffer_object). The function works quite simply; when you call it for a texture, mipmaps are generated for that texture:
http://www.opengl.org/wiki/Common_Mistakes#Automatic_mipmap_generation
glTexImage2D(GL_TEXTURE_2D, 0, numComponents == 3 ? GL_RGB : GL_RGBA, imageWidth, imageHeight, 0, numComponents == 3 ? GL_RGB : GL_RGBA, GL_UNSIGNED_BYTE, imagePtr);
glGenerateMipmap(GL_TEXTURE_2D); // Generate mipmaps now!!
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 4);
glGenerateMipmap(GL_TEXTURE_2D); // Generate mipmaps now!!
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 4);
lecture16
OpenGL Texture Mapping Filtering & Environment Parameters
Wrapping parameters (CLAMP | CLAMP_TO_EDGE | GL_REPEAT | GL_MIRRORED_REPEAT)
// Square Vertices Texture Coordinates
squareTextureCoords.push_back(glm::vec2(-1.0f, -1.0f));
squareTextureCoords.push_back(glm::vec2(3.0f, -1.0f));
squareTextureCoords.push_back(glm::vec2(3.0f, 3.0f));
squareTextureCoords.push_back(glm::vec2(-1.0f, 3.0f));
//(왼쪽 아래)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
//(오른쪽 아래)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
//(왼쪽 위)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
//(오른쪽 위)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
squareTextureCoords.push_back(glm::vec2(-1.0f, -1.0f));
squareTextureCoords.push_back(glm::vec2(3.0f, -1.0f));
squareTextureCoords.push_back(glm::vec2(3.0f, 3.0f));
squareTextureCoords.push_back(glm::vec2(-1.0f, 3.0f));
//(왼쪽 아래)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
//(오른쪽 아래)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
//(왼쪽 위)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
//(오른쪽 위)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
4500481641.cppMagnification/Minification/Mipmap filter parameters (NEAREST | LINEAR)
//(위왼쪽)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
//(위오른쪽)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
//(아래왼쪽)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
//(아래오른쪽)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
//(위오른쪽)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
//(아래왼쪽)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
//(아래오른쪽)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
3006233632.cpp