NDK opengles2.0 贴图有问题

shongbee2 2013-03-25 12:33:27

我在学习用NDK来写opengles。
我想实现一个给三角面片添加一张贴图的效果。
我是在官方的hello-gl2的基础上修改的。
现在遇到了问题：
在手机上会出现三角面片，但是三角面片是黑色的。我的贴图颜色是青色的。不知道哪里出问题了。
希望有人帮我看看：
代码：



/*

 * Copyright (C) 2009 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */



// OpenGL ES 2.0 code



#include <jni.h>

#include <android/log.h>



#include <GLES2/gl2.h>

#include <GLES2/gl2ext.h>



#include <stdio.h>

#include <stdlib.h>

#include <math.h>



#define  LOG_TAG    "libgl2jni"

#define  LOGI(...)  __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)

#define  LOGE(...)  __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)



static void printGLString(const char *name, GLenum s) {

    const char *v = (const char *) glGetString(s);

    LOGI("GL %s = %s\n", name, v);

}



static void checkGlError(const char* op) {

    for (GLint error = glGetError(); error; error

            = glGetError()) {

        LOGI("after %s() glError (0x%x)\n", op, error);

    }

}



static const char gVertexShader[] = 

	"attribute vec4 vPosition;\n"

	"attribute vec2 TexCoordIn;\n"

	"varying vec2 TexCoordOut;\n"

	"void main() {\n"

	"gl_Position = vPosition;\n"

	"TexCoordOut = TexCoordIn;\n"

	"}\n";



static const char gFragmentShader[] = 

	"precision mediump float;\n"

	"varying vec2 TexCoordOut;\n"

	"uniform sampler2D Texture;\n"

	"void main() {\n"

	"vec4 vColor = texture2D(Texture, TexCoordOut);\n"

	//"  gl_FragColor = vec4(1.0, 1.0, 0.0, 1.0);\n"

	"}\n";



GLuint loadShader(GLenum shaderType, const char* pSource) {

    GLuint shader = glCreateShader(shaderType);

    if (shader) {

        glShaderSource(shader, 1, &pSource, NULL);

        glCompileShader(shader);

        GLint compiled = 0;

        glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);

        if (!compiled) {

            GLint infoLen = 0;

            glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLen);

            if (infoLen) {

                char* buf = (char*) malloc(infoLen);

                if (buf) {

                    glGetShaderInfoLog(shader, infoLen, NULL, buf);

                    LOGE("Could not compile shader %d:\n%s\n",

                            shaderType, buf);

                    free(buf);

                }

                glDeleteShader(shader);

                shader = 0;

            }

        }

    }

    return shader;

}



GLuint createProgram(const char* pVertexSource, const char* pFragmentSource) {

    GLuint vertexShader = loadShader(GL_VERTEX_SHADER, pVertexSource);

    if (!vertexShader) {

        return 0;

    }



    GLuint pixelShader = loadShader(GL_FRAGMENT_SHADER, pFragmentSource);

    if (!pixelShader) {

        return 0;

    }



    GLuint program = glCreateProgram();

    if (program) {

        glAttachShader(program, vertexShader);

        checkGlError("glAttachShader");

        glAttachShader(program, pixelShader);

        checkGlError("glAttachShader");

        glLinkProgram(program);

        GLint linkStatus = GL_FALSE;

        glGetProgramiv(program, GL_LINK_STATUS, &linkStatus);

        if (linkStatus != GL_TRUE) {

            GLint bufLength = 0;

            glGetProgramiv(program, GL_INFO_LOG_LENGTH, &bufLength);

            if (bufLength) {

                char* buf = (char*) malloc(bufLength);

                if (buf) {

                    glGetProgramInfoLog(program, bufLength, NULL, buf);

                    LOGE("Could not link program:\n%s\n", buf);

                    free(buf);

                }

            }

            glDeleteProgram(program);

            program = 0;

        }

    }

    return program;

}



GLuint gProgram;

GLuint gvPositionHandle;

GLuint floorTexture;

GLuint fishTexture;

GLuint texCoordSlot;

GLuint textureUniform;



bool setupGraphics(int w, int h) {

    printGLString("Version", GL_VERSION);

    printGLString("Vendor", GL_VENDOR);

    printGLString("Renderer", GL_RENDERER);

    printGLString("Extensions", GL_EXTENSIONS);



    LOGI("setupGraphics(%d, %d)", w, h);

    gProgram = createProgram(gVertexShader, gFragmentShader);

    if (!gProgram) {

        LOGE("Could not create program.");

        return false;

    }

    gvPositionHandle = glGetAttribLocation(gProgram, "vPosition");

    checkGlError("glGetAttribLocation");

    LOGI("glGetAttribLocation(\"vPosition\") = %d\n",

            gvPositionHandle);

	texCoordSlot = glGetAttribLocation(gProgram, "TexCoordIn");

	textureUniform = glGetUniformLocation(gProgram, "Texture");



	unsigned short embTex[128*128];

	unsigned short color[4]={ 0xF800, 0x7E0, 0x1F, 0xffff };

	for ( int i = 0; i < 128; ++i )

	{

		for ( int j = 0; j < 128; ++j )

		{

			//embTex[i*128+j] = color[(i/32 + j/32)%4];

			embTex[i*128+j] = color[0];

		}

	}



	GLuint texName;

	glGenTextures(1, &texName);

	glBindTexture(GL_TEXTURE_2D, texName);

	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 128, 128, 0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, embTex);

	floorTexture = texName;

	fishTexture = texName;

	LOGI("floorTexture(\"floorTexture\") = %d\n",

		floorTexture);

	glActiveTexture(GL_TEXTURE0); 

	glBindTexture(GL_TEXTURE_2D, floorTexture);

	glUniform1i(textureUniform, 0);



    glViewport(0, 0, w, h);

    checkGlError("glViewport");

    return true;

}



const GLfloat gTriangleVertices[] = { 0.0f, 0.5f, -0.5f, -0.5f,

        0.5f, -0.5f };

const GLfloat gTriangleTexcoord[] = { 0.5f, 0.0f, 0.5f, 1.0f,

	1.0f, 1.0f };



void renderFrame() {

    static float grey = 0.5f;

    //grey += 0.01f;

    if (grey > 1.0f) {

        grey = 0.0f;

    }

    glClearColor(grey, grey, grey, 1.0f);

    checkGlError("glClearColor");

    glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);

    checkGlError("glClear");



    glUseProgram(gProgram);

    checkGlError("glUseProgram");



    glVertexAttribPointer(gvPositionHandle, 2, GL_FLOAT, GL_FALSE, 0, gTriangleVertices);

    checkGlError("glVertexAttribPointer");

    glEnableVertexAttribArray(gvPositionHandle);

    checkGlError("glEnableVertexAttribArray");

	glVertexAttribPointer(texCoordSlot, 2, GL_FLOAT, GL_FALSE,	0, gTriangleTexcoord);

	glEnableVertexAttribArray(texCoordSlot);

	checkGlError("glEnableVertexAttribArray");



	glActiveTexture(GL_TEXTURE0);

	glBindTexture(GL_TEXTURE_2D, floorTexture);

	glUniform1i(textureUniform, 0);

    glDrawArrays(GL_TRIANGLES, 0, 3);

    checkGlError("glDrawArrays");

}



extern "C" {

    JNIEXPORT void JNICALL Java_com_android_gl2jni_GL2JNILib_init(JNIEnv * env, jobject obj,  jint width, jint height);

    JNIEXPORT void JNICALL Java_com_android_gl2jni_GL2JNILib_step(JNIEnv * env, jobject obj);

};



JNIEXPORT void JNICALL Java_com_android_gl2jni_GL2JNILib_init(JNIEnv * env, jobject obj,  jint width, jint height)

{

    setupGraphics(width, height);

}



JNIEXPORT void JNICALL Java_com_android_gl2jni_GL2JNILib_step(JNIEnv * env, jobject obj)

{

    renderFrame();

}