Intel GMA HD. OpenGL driver problem. Available to use invalid texture format with FBO

idata — Tue, 15 Feb 2011 18:31:52 GMT

Hello!

Found possibility to use a texture with invalid internal format, which is used in the frame buffer object.

If the current setting of display is 16 bits, then creating a texture with:

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, fbo_width, fbo_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);

obtained a texture with internal format: R:4, G:4, B:4, A:4 - that is 4 bits per component and total 16.

Binding this texture to the FBO is completed without error. Status check glCheckFramebufferStatus(GL_FRAMEBUFFER) returns GL_FRAMEBUFFER_COMPLETE.

However, even cleaning object specific color (eg glClearColor (0.8f, 0, 0, 1)) returns an unpredictable result.

Impression that the driver works with the elements of texture as a 24/32 bit, instead of 16-bit.

If set the internal format to GL_RGBA8, the problem is not observed:

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, fbo_width, fbo_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);

Attachment graphics diagnostic report:

Intel® HD Graphics (Core i5)

Report Date: 2/9/2011

Report Time[hr:mm:ss]: 19:13:15

Driver Version: 6.14.10.5313

Operating System: Windows XP Professional Service Pack 2(5.1.2600)

Default Language: English (United States)

DirectX* Version: 9.0

Physical Memory: 1909 MB

Minimum Graphics Memory: 32 MB

Maximum Graphics Memory: 256 MB

Graphics Memory in Use: 35 MB

Processor: x86 Family 6 Model 37 Stepping 5

Processor Speed: 2393 MHz

Vendor ID: 8086

Device ID: 0046

Device Revision: 02

* Accelerator Information *

Accelerator in Use: Intel(R) HD Graphics

Video BIOS: 2077.0

Current Graphics Mode: 1920 by 1080

* Devices Connected to the Graphics Accelerator *

Active Monitors: 1

* Monitor *

Monitor Name: Plug and Play Monitor

Display Type: Analog

Gamma Value: 2.2

DDC2 Protocol: Supported

Maximum Image Size:

Horizontal: 20.08 inches

Vertical: 11.42 inches

Monitor Supported Modes:

640 by 480 (67 Hz)

640 by 480 (75 Hz)

640 by 480 (72 Hz)

640 by 480 (60 Hz)

720 by 400 (70 Hz)

800 by 600 (72 Hz)

800 by 600 (75 Hz)

800 by 600 (56 Hz)

800 by 600 (60 Hz)

832 by 624 (75 Hz)

1024 by 768 (75 Hz)

1024 by 768 (70 Hz)

1024 by 768 (60 Hz)

1152 by 864 (75 Hz)

1152 by 870 (75 Hz)

1280 by 720 (60 Hz)

1280 by 800 (60 Hz)

1280 by 1024 (75 Hz)

1280 by 1024 (60 Hz)

1360 by 765 (60 Hz)

1440 by 900 (60 Hz)

1680 by 1050 (60 Hz)

1920 by 1080 (60 Hz)

Display Power Management Support:

Standby Mode: Supported

Suspend Mode: Supported

Active Off Mode: Not Supported

Raw EDID:

00 FF FF FF FF FF FF 00 04 72 C8 00 BA A6 40 01

0E 14 01 03 68 33 1D 78 CA EE 95 A3 54 4C 99 26

0F 50 54 BF EF 80 71 4F 81 80 81 C0 81 00 8B C0

95 00 B3 00 D1 C0 02 3A 80 18 71 38 2D 40 58 2C

45 00 FE 1F 11 00 00 1E 00 00 00 FD 00 38 4C 1F

53 11 00 0A 20 20 20 20 20 20 00 00 00 FC 00 56

32 33 33 48 0A 20 20 20 20 20 20 20 00 00 00 FF

00 4C 47 51 30 44 30 32 39 38 35 31 33 0A 00 44

* SDVO Encoder Report *

** Encoder 1 **

Vendor ID: Chrontel

Device ID: 66

Device Revision: 2

Major Version: 1

Minor Version: 1

* Other names and brands are the property of their respective owners. *

topic Intel GMA HD. OpenGL driver problem. Available to use invalid texture format with FBO in Graphics

Intel GMA HD. OpenGL driver problem. Available to use invalid texture format with FBO