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dlangui.graphics.glsupport module now draws with VBOs and VAOs

This commit is contained in:
Donny Viszneki 2014-08-13 19:02:54 -07:00
parent 198f685665
commit 4fa76dc40e
1 changed files with 92 additions and 11 deletions
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103
src/dlangui/graphics/glsupport.d
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@ -39,12 +39,28 @@ private void LVGLFillColor(uint color, float * buf, int count) {
}
}
/// for OpenGL calls diagnostics.
private bool checkError(string context, string file = __FILE__, int line = __LINE__) {
int err = glGetError();
if (err != GL_NO_ERROR) {
//string errorString = fromStringz(gluErrorString());
Log.e("OpenGL error ", err, " at ", file, ":", line, " -- ", context);
/* For reporting OpenGL errors, it's nicer to get a human-readable symbolic name for the
* error instead of the numeric form. Derelict's GLenum is just an alias for uint, so we
* can't depend on D's nice toString() for enums.
*/
private immutable(string[int]) errors;
static this() {
errors = [
0x0500: "GL_INVALID_ENUM",
0x0501: "GL_INVALID_VALUE",
0x0502: "GL_INVALID_OPERATION",
0x0505: "GL_OUT_OF_MEMORY"
];
}
/* Convenient wrapper around glGetError()
* TODO use one of the DEBUG extensions instead
*/
bool checkError(string context="", string file=__FILE__, int line=__LINE__)
{
GLenum err = glGetError();
if (err != GL_NO_ERROR)
{
Log.e("OpenGL error ", err in errors ? errors[err] : to!string(err), " at ", file, ":", line, " -- ", context);
return true;
}
return false;
@ -526,14 +542,36 @@ class SolidFillProgram : GLProgram {
return false;
beforeExecute();
GLuint vao;
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
GLuint vbo;
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(
GL_ARRAY_BUFFER,
vertices.length * vertices[0].sizeof + colors.length * colors[0].sizeof,
null,
GL_STREAM_DRAW);
glBufferSubData(
GL_ARRAY_BUFFER,
0,
vertices.length * vertices[0].sizeof,
vertices.ptr);
glBufferSubData(
GL_ARRAY_BUFFER,
vertices.length * vertices[0].sizeof,
colors.length * colors[0].sizeof, colors.ptr);
glEnableVertexAttribArray(vertexLocation);
checkError("glEnableVertexAttribArray");
glVertexAttribPointer(vertexLocation, 3, GL_FLOAT, GL_FALSE, float.sizeof * 3, vertices.ptr);
glVertexAttribPointer(vertexLocation, 3, GL_FLOAT, GL_FALSE, 0, cast(void*) 0);
checkError("glVertexAttribPointer");
glEnableVertexAttribArray(colAttrLocation);
checkError("glEnableVertexAttribArray");
glVertexAttribPointer(colAttrLocation, 4, GL_FLOAT, GL_FALSE, float.sizeof * 4, colors.ptr);
glVertexAttribPointer(colAttrLocation, 4, GL_FLOAT, GL_FALSE, 0, cast(void*) (float.sizeof*3*6));
checkError("glVertexAttribPointer");
glDrawArrays(GL_TRIANGLES, 0, 6);
@ -545,6 +583,12 @@ class SolidFillProgram : GLProgram {
checkError("glDisableVertexAttribArray");
afterExecute();
glBindBuffer(GL_ARRAY_BUFFER, 0);
glDeleteBuffers(1, &vbo);
glBindVertexArray(0);
glDeleteVertexArrays(1, &vao);
return true;
}
}
@ -600,13 +644,43 @@ class TextureProgram : SolidFillProgram {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, linear ? GL_LINEAR : GL_NEAREST);
checkError("drawColorAndTextureRect - glTexParameteri");
GLuint vao;
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
GLuint vbo;
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(
GL_ARRAY_BUFFER,
vertices.length * vertices[0].sizeof +
colors.length * colors[0].sizeof +
texcoords.length * texcoords[0].sizeof,
null,
GL_STREAM_DRAW);
glBufferSubData(
GL_ARRAY_BUFFER,
0,
vertices.length * vertices[0].sizeof,
vertices.ptr);
glBufferSubData(
GL_ARRAY_BUFFER,
vertices.length * vertices[0].sizeof,
colors.length * colors[0].sizeof,
colors.ptr);
glBufferSubData(
GL_ARRAY_BUFFER,
vertices.length * vertices[0].sizeof + colors.length * colors[0].sizeof,
texcoords.length * texcoords[0].sizeof,
texcoords.ptr);
glEnableVertexAttribArray(vertexLocation);
glEnableVertexAttribArray(colAttrLocation);
glEnableVertexAttribArray(texCoordLocation);
glVertexAttribPointer(vertexLocation, 3, GL_FLOAT, GL_FALSE, 0, vertices.ptr);
glVertexAttribPointer(colAttrLocation, 4, GL_FLOAT, GL_FALSE, 0, colors.ptr);
glVertexAttribPointer(texCoordLocation, 2, GL_FLOAT, GL_FALSE, 0, texcoords.ptr);
glVertexAttribPointer(vertexLocation, 3, GL_FLOAT, GL_FALSE, 0, cast(void*) 0);
glVertexAttribPointer(colAttrLocation, 4, GL_FLOAT, GL_FALSE, 0, cast(void*) (vertices.length * vertices[0].sizeof));
glVertexAttribPointer(texCoordLocation, 2, GL_FLOAT, GL_FALSE, 0, cast(void*) (vertices.length * vertices[0].sizeof + colors.length * colors[0].sizeof));
glDrawArrays(GL_TRIANGLES, 0, 6);
checkError("glDrawArrays");
@ -616,6 +690,13 @@ class TextureProgram : SolidFillProgram {
glDisableVertexAttribArray(texCoordLocation);
afterExecute();
glBindBuffer(GL_ARRAY_BUFFER, 0);
glDeleteBuffers(1, &vbo);
glBindVertexArray(0);
glDeleteVertexArrays(1, &vao);
glBindTexture(GL_TEXTURE_2D, 0);
checkError("glBindTexture");
return true;