{"id":3832,"date":"2018-03-01T18:23:28","date_gmt":"2018-03-01T10:23:28","guid":{"rendered":"http:\/\/www.bookcard.net\/wordpress\/?p=3832"},"modified":"2018-10-14T21:22:46","modified_gmt":"2018-10-14T13:22:46","slug":"opengl_texture","status":"publish","type":"post","link":"https:\/\/www.bookcard.net\/wordpress\/opengl_texture\/","title":{"rendered":"OpenGL\u4e4b\u7d0b\u7406\u6620\u5c04"},"content":{"rendered":"
\"\"<\/a>
OpenGL\u4e4b\u7d0b\u7406\u6620\u5c04<\/figcaption><\/figure>\n

\u5c07\u7d0b\u7406\u6620\u5c04\u52303D\u6a21\u578b\u662f\u9769\u547d\u6027\u6280\u8853,\u7d66\u4eba\u5e36\u4f86\u7167\u7247\u822c\u9707\u64bc\u903c\u771f\u6548\u679c,\u7c21\u55ae\u4f86\u8b1b\u7d0b\u7406\u6620\u5c04\u5c31\u662f\u5c07\u5716\u7247\u9644\u8457\u65bc\u591a\u908a\u5f62\u4e4b\u4e0a,\u9019\u6a23\u7684\u5716\u7247\u7a31\u4e4b\u70ba\u7d0b\u7406,\u4f60\u53ef\u4ee5\u5c07\u5e73\u92ea\u7684\u5730\u5716\u6620\u5c04\u5230\u7403\u9ad4\u4e0a\u5f9e\u800c\u5f97\u52303D\u5730\u7403\u6a21\u578b,\u4e0b\u9762\u4ee5\u6e32\u67d3\u6728\u7bb1\u70ba\u4f8b\u7684\u6f14\u793a\u7a0b\u5f0f:\u4e0b\u8f09<\/p>\n\n\n\n\n\n\n
\u751f\u6210\u7d0b\u7406\u5c0d\u50cf<\/td>\n\u7c21\u4ecb<\/td>\n<\/tr>\n
void glGenTextures(GLsizei n,GLuint *textures);<\/td>\n\u751f\u6210\u7d0b\u7406\u4e26\u8fd4\u56de\u7d0b\u7406\u300e\u7d22\u5f15\u300f\u5373ID\u7de8\u865f<\/td>\n<\/tr>\n
n<\/td>\n\u7d0b\u7406\u500b\u6578<\/td>\n<\/tr>\n
textures<\/td>\n\u6578\u7d44,\u8fd4\u56de\u7d0b\u7406ID<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n\n
\u7d81\u5b9a\u7d0b\u7406<\/td>\n\u7c21\u4ecb<\/td>\n<\/tr>\n
void glBindTexture(GLenum target,GLuint texture);<\/td>\n\u751f\u6210\u7d0b\u7406\u4e4b\u5f8c\u8981\u9032\u884c\u7d81\u5b9a<\/td>\n<\/tr>\n
Target<\/td>\nGL_TEXTURE_1D:1\u7dad\u7d0b\u7406<\/p>\n

GL_TEXTURE_2D:2\u7dad\u7d0b\u7406<\/td>\n<\/tr>\n

Textures<\/td>\n\u7d0b\u7406ID\u6578\u7d44<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n\n\n
\u904e\u6ffe\u7d0b\u7406<\/td>\n\u7c21\u4ecb<\/td>\n<\/tr>\n
void glTexParameteri(GLenum target,GLenum pname,GLint param);<\/td>\n\u7d81\u5b9a\u4e4b\u5f8c\u8981\u8a2d\u5b9a\u7d0b\u7406\u904e\u6ffe<\/td>\n<\/tr>\n
target:<\/td>\nGL_TEXTURE_1D:1\u7dad\u7d0b\u7406<\/p>\n

GL_TEXTURE_2D:2\u7dad\u7d0b\u7406<\/td>\n<\/tr>\n

pname:<\/td>\nGL_TEXTURE_MIN_FILTER:\u7e2e\u5c0f\u904e\u6ffe<\/p>\n

GL_TEXTURE_MAG_FILTER:\u653e\u5927\u904e\u6ffe<\/p>\n

GL_TEXTURE_WRAP_S:\u7d0b\u7406S\u5ea7\u6a19<\/p>\n

GL_TEXTURE_WRAP_T:\u7d0b\u7406T\u5ea7\u6a19<\/td>\n<\/tr>\n

param:<\/p>\n

 <\/td>\n

GL_REPEAT:\u91cd\u8907(\u5e73\u92ea)\u7d0b\u7406<\/p>\n

GL_CLAMP:\u593e\u6301\u7d0b\u7406<\/p>\n

GL_LINEAR:\u50cf\u7d20\u63a1\u6a23\u7dda\u6027\u63d2\u503c(\u52a0\u6b0a\u5e73\u5747)<\/p>\n

GL_NEAREST:\u50cf\u7d20\u63a1\u6a23\u6700\u63a5\u8fd1\u4e2d\u5fc3\u7d0b\u7406<\/p>\n

GL_NEAREST_MIPMAP_NEAREST:\u7d0b\u7406\u93c8\u63a1\u6a23\u4f7f\u7528NEAREST,\u904e\u6ffe\u4f7f\u7528NEAREST<\/p>\n

GL_NEAREST_MIPMAP_LINEAR:\u7d0b\u7406\u93c8\u63a1\u6a23\u4f7f\u7528NEAREST,\u904e\u6ffe\u4f7f\u7528LINEAR<\/p>\n

GL_LINEAR_MIPMAP_NEAREST:\u7d0b\u7406\u93c8\u63a1\u6a23\u4f7f\u7528LINEAR,\u904e\u6ffe\u4f7f\u7528NEAREST<\/p>\n

GL_LINEAR_MIPMAP_LINEAR:\u7d0b\u7406\u93c8\u63a1\u6a23\u4f7f\u7528LINEAR,\u904e\u6ffe\u4f7f\u7528LINEAR<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n
\u8f09\u5165\u7d0b\u7406<\/td>\n\u7c21\u4ecb<\/td>\n<\/tr>\n
void glTexImage2D(GLenum target,GLint\u00a0\u00a0 level,GLint internalformat,GLsizei width,GLsizei height,GLint border,GLint format,GLenum\u00a0 type,const GLvoid *pixels);<\/td>\n\u8a2d\u5b9a\u7d0b\u7406\u904e\u6ffe\u5f8c\u9700\u8981\u628a\u7d0b\u7406\u8f09\u5165OpenGL<\/p>\n

type:\u6700\u5e38\u7528GL_UNSIGNED_BYTE(\u7121\u7b26\u865f8Bit)<\/p>\n

pixels:\u7d0b\u7406\u6578\u64da<\/td>\n<\/tr>\n

target:<\/td>\nGL_TEXTURE_1D:1\u7dad\u7d0b\u7406<\/p>\n

GL_TEXTURE_2D:2\u7dad\u7d0b\u7406<\/td>\n<\/tr>\n

level:<\/td>\n\u7d0b\u7406\u93c8\u7d22\u5f15,\u82e5\u53ea\u6709\u55ae\u500b\u7d0b\u7406\u5247\u8a2d\u70ba0<\/td>\n<\/tr>\n
internalformat:<\/td>\n\u6700\u5e38\u7528GL_RGBA\u6216GL_RGB<\/td>\n<\/tr>\n
width:<\/td>\n\u7d0b\u7406\u5bec\u5ea6<\/td>\n<\/tr>\n
height:<\/td>\n\u7d0b\u7406\u9ad8\u5ea6<\/td>\n<\/tr>\n
border:<\/td>\n\u7d0b\u7406\u662f\u5426\u6709\u8b8a\u6846,0\u6c92\u6709\u908a\u6846,1\u6709\u908a\u6846<\/td>\n<\/tr>\n
format:<\/td>\n\u6700\u5e38\u7528GL_RGBA\u6216GL_RGB<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n
\u7d0b\u7406\u5ea7\u6a19\u8207\u9802\u9ede\u5ea7\u6a19<\/td>\n\u7c21\u4ecb<\/td>\n<\/tr>\n
void glTexCoord2f (GLfloat s, GLfloat t);<\/td>\n\u8a2d\u5b9a\u7d0b\u7406\u5ea7\u6a19(s,t), s\u8ef8\u7d0b\u7406\u7684x\u5ea7\u6a19,t\u8ef8\u70ba\u7d0b\u7406\u7684y\u5ea7\u6a19,\u7d0b\u7406\u5ea7\u6a19\u5fc5\u9700\u5728\u9802\u9ede\u5ea7\u6a19\u4e4b\u524d\u8a2d\u5b9a<\/td>\n<\/tr>\n
void glVertex3f(GLfloat x,GLfloat y,GLfloat z);<\/td>\n\u8a2d\u5b9a\u9802\u9ede\u5ea7\u6a19,\u4e26\u8207\u7d0b\u7406\u5ea7\u6a19\u5339\u914d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u5b9a\u7fa9\u7d0b\u7406\u7d50\u69cb<\/td>\n\u7c21\u4ecb<\/td>\n<\/tr>\n
typedef struct TEXTURE_TYP{<\/td>\n\u6b64\u7d50\u69cb\u7528\u65bc\u4fdd\u5b58\u7d0b\u7406\u4f4d\u5716\u4fe1\u606f<\/td>\n<\/tr>\n
int\u00a0\u00a0 width;<\/td>\n\u7d0b\u7406\u5bec\u5ea6<\/td>\n<\/tr>\n
int\u00a0\u00a0 height;<\/td>\n\u7d0b\u7406\u9ad8\u5ea6<\/td>\n<\/tr>\n
int\u00a0\u00a0 bitCount;<\/td>\n\u4f4d\u5716\u50cf\u7d20\u7684bits (8BIT,16BIT,24BIT,32BIT)<\/td>\n<\/tr>\n
int\u00a0\u00a0 size;<\/td>\n\u7d0b\u7406\u6578\u64da\u7684\u5927\u5c0f<\/td>\n<\/tr>\n
PALETTEENTRY paletteentry;<\/td>\n\u4f4d\u5716\u8abf\u8272\u677f<\/td>\n<\/tr>\n
GLuint\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ID;<\/td>\n\u7d0b\u7406ID<\/td>\n<\/tr>\n
PBYTE images[32];<\/td>\nmipmap\u7d0b\u7406\u93c8<\/td>\n<\/tr>\n
int\u00a0\u00a0 count;<\/td>\n\u7d0b\u7406\u93c8\u500b\u6578<\/td>\n<\/tr>\n
}TEXTURE, *TEXTURE_PTR;<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

 <\/p>\n

\u7d0b\u7406\u6620\u5c04\u4ee3\u78bc\u793a\u4f8b<\/p>\n

1.\u555f\u7528\u6df1\u5ea6\u7de9\u885d\u6e2c\u8a66,\u53ef\u4fdd\u8b49\u591a\u908a\u5f62\u88ab\u6b63\u78ba\u7e6a\u88fd<\/p>\n

glEnable(GL_DEPTH_TEST);<\/p>\n

2.\u555f\u52d5\u6f38\u8b8a\u6548\u679c<\/p>\n

glShadeModel(GL_SMOOTH);<\/p>\n

3.\u555f\u52d5\u591a\u908a\u5f62\u96b1\u9762\u88c1\u526a(\u6d88\u9664\u96b1\u85cf\u9762)\u5982\u679c\u8981\u7a7f\u8d8a\u5be6\u9ad4\u5247\u7121\u9700\u555f\u52d5<\/p>\n

glEnable(GL_CULL_FACE);<\/p>\n

4.\u8a2d\u80cc\u9762\u70ba\u96b1\u9762<\/p>\n

glCullFace(GL_BACK);<\/p>\n

5.\u591a\u908a\u5f62\u6b63\u9762\u4f7f\u7528\u9006\u6642\u91dd<\/p>\n

glFrontFace(GL_CCW);<\/p>\n

6.\u555f\u75282D\u7d0b\u7406\u6620\u5c04<\/p>\n

glEnable(GL_TEXTURE_2D);<\/p>\n

7.\u8f09\u5165\u4f4d\u5716\u7d0b\u7406(.bmp\u5716\u6a94)( .tga\u5716\u6a94)<\/p>\n

TEXTURE texture;<\/p>\n

Load_File_Texture(&texture,path);<\/p>\n

8.\u751f\u62101\u500b\u7d0b\u7406<\/p>\n

glGenTextures(1, &texture->ID);<\/p>\n

9.\u7d81\u5b9a\u7d0b\u7406<\/p>\n

glBindTexture(GL_TEXTURE_2D, texture->ID);<\/p>\n

10.\u653e\u5927\u7d0b\u7406\u50cf\u7d20\u63a1\u6a23\u6700\u63a5\u8fd1\u4e2d\u5fc3\u7d0b\u7406<\/p>\n

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);<\/p>\n

11.\u7e2e\u5c0f\u7d0b\u7406\u904e\u6ffe\u50cf\u7d20\u63a1\u6a23\u6700\u63a5\u8fd1\u4e2d\u5fc3\u7d0b\u7406<\/p>\n

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);<\/p>\n

12.\u8f09\u5165\u7d0b\u7406<\/p>\n

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, texture->width, texture->height, 0, GL_RGB, GL_UNSIGNED_BYTE, texture->image[0]);<\/p>\n

 <\/p>\n

\u5f9e\u6307\u5b9a\u7684\u78c1\u76e4\u8def\u5f91\u8f09\u5165\u7d0b\u7406\u51fd\u5f0f<\/p>\n

bool Load_File_Texture(TEXTURE_PTR texture,const char * path)<\/p>\n

{<\/p>\n

char drive[_MAX_DRIVE] = { 0 };\/\/ \u9a45\u52d5\u5668\u76e4\u7b26<\/p>\n

char dir[_MAX_DIR] = { 0 };\u00a0\u00a0\u00a0 \/\/ \u76ee\u9304<\/p>\n

char fname[_MAX_FNAME] = { 0 };\/\/ \u6587\u4ef6\u540d<\/p>\n

char ext[_MAX_EXT] = { 0 };\u00a0\u00a0\u00a0 \/\/ \u64f4\u5c55\u540d!<\/p>\n

BITMAP_FILE bitmap;<\/p>\n

TARGA_FILE\u00a0 targa;<\/p>\n

PCX\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 pcx;<\/p>\n

if (texture == NULL || path == NULL)<\/p>\n

return false;<\/p>\n

\/\/\u5c07\u8def\u5f91\u540d\u5206\u62c6\u70ba\u7d44\u4ef6!<\/p>\n

_splitpath(path, drive, dir, fname, ext);<\/p>\n

if (stricmp(ext, “.bmp”) == 0)\/\/ \u8f09\u5165\u4f4d\u5716<\/p>\n

{<\/p>\n

Load_Bitmap<\/a>(&bitmap, path);\/\/ \u8f09\u5165BMP\u6587\u6a94<\/p>\n

Load_Bitmap_Texture(texture, &bitmap);\/\/ \u8f09\u5165\u7d0b\u7406<\/p>\n

}<\/p>\n

else<\/p>\n

if (stricmp(ext, “.tga”) == 0)\/\/ \u8f09\u5165\u4f4d\u5716<\/p>\n

{<\/p>\n

Load_Targa<\/a>(&targa, path); \/\/ \u8f09\u5165tga\u6587\u6a94<\/p>\n

Load_Targa_Texture(texture, &targa);\/\/ \u8f09\u5165\u7d0b\u7406<\/p>\n

}<\/p>\n

else<\/p>\n

if (stricmp(ext, “.pcx”) == 0)\/\/ \u8f09\u5165\u4f4d\u5716<\/p>\n

{<\/p>\n

Load_PCX<\/a>(&pcx, path); \/\/ \u8f09\u5165PCX\u6587\u6a94<\/p>\n

Load_PCX_Texture(texture, &pcx);\/\/ \u8f09\u5165\u7d0b\u7406<\/p>\n

}<\/p>\n

return false;<\/p>\n

}<\/p>\n

\u6fc0\u6d3b\u7d0b\u7406<\/p>\n

void Bind_Texture(TEXTURE_PTR texture){<\/p>\n

glEnable(GL_TEXTURE_2D);<\/p>\n

glBindTexture(GL_TEXTURE_2D, texture->ID);\/\/ \u7d81\u5b9a\u7d0b\u7406<\/p>\n

}<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

\u5c07\u7d0b\u7406\u6620\u5c04\u52303D\u6a21\u578b\u662f\u9769\u547d\u6027\u6280\u8853,\u7d66\u4eba\u5e36\u4f86\u7167\u7247\u822c\u9707\u64bc\u903c\u771f\u6548\u679c,\u7c21\u55ae\u4f86\u8b1b\u7d0b\u7406\u6620\u5c04\u5c31\u662f\u5c07\u5716\u7247\u9644\u8457\u65bc\u591a\u908a\u5f62\u4e4b\u4e0a,\u9019\u6a23 … <\/p>\n

\u7e7c\u7e8c\u95b1\u8b80 OpenGL\u4e4b\u7d0b\u7406\u6620\u5c04<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62],"tags":[50],"class_list":["post-3832","post","type-post","status-publish","format-standard","hentry","category-opengl","tag-opengl","entry"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3832","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/comments?post=3832"}],"version-history":[{"count":5,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3832\/revisions"}],"predecessor-version":[{"id":4187,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3832\/revisions\/4187"}],"wp:attachment":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/media?parent=3832"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/categories?post=3832"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/tags?post=3832"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}