openGL 2.0 with jpeg textures

Hi devs,

I have a problem texturing a plane with textures with opengl 2.0. I am able to make the aircraft with colors, but as soon as I try to apply textures, I'm not. Instead, I see a shaded gray screen. So I guess that the vertices of the geometry and the viewport, etc. are correct, but something wrong with the application of textures. Does anyone have a sample code snippet to bind the texture on a plane using opengl 2.0? I want to use the triangle strip.

Here are the steps I used to create a simple plan with a texture

-Once I've created the foreign window and initiated openGL.

-This is my plane vertices and texture coordinates

summits [0] = - 10.0f;
summits [1] = - 10.0f;
vertices [2] = - 10.0f;

summits [3] = 10.0f;
summits [4] = - 10.0f;
summits [5] = - 10.0f;

summits [6] = - 10.0f;
summits [7] = 10.0f;
summits [8] = - 10.0f;

summits [9] = 10.0f;
summits [10] = 10.0f;
summits [11] = - 10.0f;

textures [0] = 0;
textures [1] = 0;
textures [2] = 1;
textures [3] = 0;
textures [4] = 0;
textures [5] = 1;
textures [6] = 1;
textures [7] = 1;

const char * = vSource
"precision float mediump;
"uniform mat4 u_projection;
"attribute vec2 a_TexCoordinate;
"attribute vec4 a_position;
"attribute vec4 a_color;
"various vec4 v_color;
"various vec2 v_texCoordinate;
"Sub main().
"{"
"gl_Position = u_projection * a_position;
"v_texCoordinate = a_TexCoordinate;"

"v_color = a_color;"
"}";

const char * fSource =
"various lowp vec4 v_color;
"u_Texture sampler2D uniform;
"various vec2 v_TexCoordinate;
"Sub main().
"{"
"gl_FragColor = v_color;"
"gl_FragColor = texture2D (u_Texture, v_TexCoordinate);"
"}";

-J' compiled the fragment and vertex shader and related program

I created the projection with perspective view matrix

GLuint projectionLoc is glGetUniformLocation (program, "u_projection");.
GLfloat left = - 4.0f;
GLfloat right = 4.0f;
GLfloat low = - 3.0f;
GLfloat top = 3.0f;
GLfloat zNear = 4.0f;
GLfloat zFar = 50.0f;
GLfloat proj [16] = {2.0 * zNear / (right-left), //0}
0, //1
0, //2
0, //3
0, //4
2.0 * zNear / (up-down), //5
0, //6
0, //7
(right + left) / (right - left), //8
(top + bottom) /(top-bottom), //9
-(zFar+zNear) /(zFar-zNear), //10
-1, //11
0, / / 12
0, / / 13
-(2 * zFar * zNear) /(zFar-zNear), / / 14
0}; 15

-Generated vertex and filled with data
glGenBuffers (1, & vertexID);
glBindBuffer (GL_ARRAY_BUFFER, vertexID);
glBufferData (GL_ARRAY_BUFFER, sizeof (vertices), tops, GL_STATIC_DRAW);

-Generated in buffers for texture coordinates. It is perhaps here lies the problem.

glGenBuffers (1, & textureId);
glBindBuffer (GL_ARRAY_BUFFER, textureId);
glBufferData (GL_ARRAY_BUFFER, sizeof (textures), textures, GL_STATIC_DRAW);

-The extracted texture assets/images folder

UINT textureArray [1];

QString appFolder(QDir::homePath());)
appFolder.chop (4);
QString path = appFolder + ' / app/native/assets/images/left.jpg ';

-J' used the method CreateTextures of the http://perso.limsi.fr/jacquemi/IG-TD/texjpeg.cpp link

CreateTexture (textureArray, path.toAscii () .data (), 0);

-Set viewport and activated 2d, texture etc.

glViewport (0, 0, surface_width, surface_height);

Typical render pass
glClear(GL_COLOR_BUFFER_BIT |) GL_DEPTH_BUFFER_BIT);

glClearDepthf(1.0f);
glClearColor (0.0f, 1.0F, 0.0f, 1.0F);

glEnable (gldisable(gl_cull_face));

glEnable (GL_TEXTURE_2D);

glEnable (GL_BLEND);

-Permitted and bind the vertex data

glEnableVertexAttribArray (positionLoc);
glBindBuffer (GL_ARRAY_BUFFER, vertexID);
glVertexAttribPointer (positionLoc, 3, GL_FLOAT, GL_FALSE, 3 * sizeof (GLfloat), 0);

-Permitted and bind texture information. It is once again where the lies of the question can be

glEnableVertexAttribArray (textureLoc);
glBindBuffer (GL_ARRAY_BUFFER, textureId);
glVertexAttribPointer (textureLoc, 2, GL_FLOAT, GL_FALSE, 4 * sizeof (GLfloat), 0);

glUniformMatrix4fv (projectionLoc, 1, false, proj);
glUniform1i(textureLoc,0);

-Drew tables with GL_TIANGLE_STRIP

glDrawArrays (GL_TRIANGLE_STRIP, 0, 4);

Disable the berries of the attribute
glDisableVertexAttribArray (positionLoc);
glDisableVertexAttribArray (colorLoc);
glDisableVertexAttribArray (textureLoc);

-Stamps exchanged

int rc = eglSwapBuffers (egl_disp, egl_surf);
If (rc! = EGL_TRUE) {}
fprintf (stderr, "Swap buffer failed\n");
} else {}
fprintf (stderr, "Swap buffer passed\n");
}

-Thanks in advance

~ {A * beep * osh}

Try to capitalize the "t" in this line

"various vec2 v_texCoordinate;

in your vertex shader and see if that helps.

Tags: BlackBerry Developers

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